/(a)b|/I Capturing subpattern count = 1 No options No first char No need char /abc/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' abc 0: abc defabc 0: abc \Aabc 0: abc *** Failers No match \Adefabc No match ABC No match /^abc/I Capturing subpattern count = 0 Options: anchored No first char No need char abc 0: abc \Aabc 0: abc *** Failers No match defabc No match \Adefabc No match /a+bc/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'c' /a*bc/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'c' /a{3}bc/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'c' /(abc|a+z)/I Capturing subpattern count = 1 Partial matching not supported No options First char = 'a' No need char /^abc$/I Capturing subpattern count = 0 Options: anchored No first char No need char abc 0: abc *** Failers No match def\nabc No match /ab\idef/X Failed: unrecognized character follows \ at offset 3 /(?X)ab\idef/X Failed: unrecognized character follows \ at offset 7 /x{5,4}/ Failed: numbers out of order in {} quantifier at offset 5 /z{65536}/ Failed: number too big in {} quantifier at offset 7 /[abcd/ Failed: missing terminating ] for character class at offset 5 /(?X)[\B]/ Failed: invalid escape sequence in character class at offset 6 /[z-a]/ Failed: range out of order in character class at offset 3 /^*/ Failed: nothing to repeat at offset 1 /(abc/ Failed: missing ) at offset 4 /(?# abc/ Failed: missing ) after comment at offset 7 /(?z)abc/ Failed: unrecognized character after (? or (?- at offset 2 /.*b/I Capturing subpattern count = 0 Partial matching not supported No options First char at start or follows newline Need char = 'b' /.*?b/I Capturing subpattern count = 0 Partial matching not supported No options First char at start or follows newline Need char = 'b' /cat|dog|elephant/I Capturing subpattern count = 0 No options No first char No need char this sentence eventually mentions a cat 0: cat this sentences rambles on and on for a while and then reaches elephant 0: elephant /cat|dog|elephant/IS Capturing subpattern count = 0 No options No first char No need char Starting byte set: c d e this sentence eventually mentions a cat 0: cat this sentences rambles on and on for a while and then reaches elephant 0: elephant /cat|dog|elephant/IiS Capturing subpattern count = 0 Options: caseless No first char No need char Starting byte set: C D E c d e this sentence eventually mentions a CAT cat 0: CAT this sentences rambles on and on for a while to elephant ElePhant 0: elephant /a|[bcd]/IS Capturing subpattern count = 0 No options No first char No need char Starting byte set: a b c d /(a|[^\dZ])/IS Capturing subpattern count = 1 No options No first char No need char Starting byte set: \x00 \x01 \x02 \x03 \x04 \x05 \x06 \x07 \x08 \x09 \x0a \x0b \x0c \x0d \x0e \x0f \x10 \x11 \x12 \x13 \x14 \x15 \x16 \x17 \x18 \x19 \x1a \x1b \x1c \x1d \x1e \x1f \x20 ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ \x7f \x80 \x81 \x82 \x83 \x84 \x85 \x86 \x87 \x88 \x89 \x8a \x8b \x8c \x8d \x8e \x8f \x90 \x91 \x92 \x93 \x94 \x95 \x96 \x97 \x98 \x99 \x9a \x9b \x9c \x9d \x9e \x9f \xa0 \xa1 \xa2 \xa3 \xa4 \xa5 \xa6 \xa7 \xa8 \xa9 \xaa \xab \xac \xad \xae \xaf \xb0 \xb1 \xb2 \xb3 \xb4 \xb5 \xb6 \xb7 \xb8 \xb9 \xba \xbb \xbc \xbd \xbe \xbf \xc0 \xc1 \xc2 \xc3 \xc4 \xc5 \xc6 \xc7 \xc8 \xc9 \xca \xcb \xcc \xcd \xce \xcf \xd0 \xd1 \xd2 \xd3 \xd4 \xd5 \xd6 \xd7 \xd8 \xd9 \xda \xdb \xdc \xdd \xde \xdf \xe0 \xe1 \xe2 \xe3 \xe4 \xe5 \xe6 \xe7 \xe8 \xe9 \xea \xeb \xec \xed \xee \xef \xf0 \xf1 \xf2 \xf3 \xf4 \xf5 \xf6 \xf7 \xf8 \xf9 \xfa \xfb \xfc \xfd \xfe \xff /(a|b)*[\s]/IS Capturing subpattern count = 1 No options No first char No need char Starting byte set: \x09 \x0a \x0c \x0d \x20 a b /(ab\2)/ Failed: reference to non-existent subpattern at offset 6 /{4,5}abc/ Failed: nothing to repeat at offset 4 /(a)(b)(c)\2/I Capturing subpattern count = 3 Max back reference = 2 No options First char = 'a' Need char = 'c' abcb 0: abcb 1: a 2: b 3: c \O0abcb Matched, but too many substrings \O3abcb Matched, but too many substrings 0: abcb \O6abcb Matched, but too many substrings 0: abcb 1: a \O9abcb Matched, but too many substrings 0: abcb 1: a 2: b \O12abcb 0: abcb 1: a 2: b 3: c /(a)bc|(a)(b)\2/I Capturing subpattern count = 3 Max back reference = 2 No options First char = 'a' No need char abc 0: abc 1: a \O0abc Matched, but too many substrings \O3abc Matched, but too many substrings 0: abc \O6abc 0: abc 1: a aba 0: aba 1: 2: a 3: b \O0aba Matched, but too many substrings \O3aba Matched, but too many substrings 0: aba \O6aba Matched, but too many substrings 0: aba 1: \O9aba Matched, but too many substrings 0: aba 1: 2: a \O12aba 0: aba 1: 2: a 3: b /abc$/IE Capturing subpattern count = 0 Options: dollar_endonly First char = 'a' Need char = 'c' abc 0: abc *** Failers No match abc\n No match abc\ndef No match /(a)(b)(c)(d)(e)\6/ Failed: reference to non-existent subpattern at offset 17 /the quick brown fox/I Capturing subpattern count = 0 No options First char = 't' Need char = 'x' the quick brown fox 0: the quick brown fox this is a line with the quick brown fox 0: the quick brown fox /the quick brown fox/IA Capturing subpattern count = 0 Options: anchored No first char No need char the quick brown fox 0: the quick brown fox *** Failers No match this is a line with the quick brown fox No match /ab(?z)cd/ Failed: unrecognized character after (? or (?- at offset 4 /^abc|def/I Capturing subpattern count = 0 No options No first char No need char abcdef 0: abc abcdef\B 0: def /.*((abc)$|(def))/I Capturing subpattern count = 3 Partial matching not supported No options First char at start or follows newline No need char defabc 0: defabc 1: abc 2: abc \Zdefabc 0: def 1: def 2: 3: def /abc/IP abc 0: abc *** Failers No match: POSIX code 17: match failed /^abc|def/IP abcdef 0: abc abcdef\B 0: def /.*((abc)$|(def))/IP defabc 0: defabc 1: abc 2: abc \Zdefabc 0: def 1: def 3: def /the quick brown fox/IP the quick brown fox 0: the quick brown fox *** Failers No match: POSIX code 17: match failed The Quick Brown Fox No match: POSIX code 17: match failed /the quick brown fox/IPi the quick brown fox 0: the quick brown fox The Quick Brown Fox 0: The Quick Brown Fox /abc.def/IP *** Failers No match: POSIX code 17: match failed abc\ndef No match: POSIX code 17: match failed /abc$/IP abc 0: abc abc\n 0: abc /(abc)\2/IP Failed: POSIX code 15: bad back reference at offset 7 /(abc\1)/IP abc No match: POSIX code 17: match failed /)/ Failed: unmatched parentheses at offset 0 /a[]b/ Failed: missing terminating ] for character class at offset 4 /[^aeiou ]{3,}/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char co-processors, and for 0: -pr /<.*>/I Capturing subpattern count = 0 Partial matching not supported No options First char = '<' Need char = '>' abcghinop 0: ghi /<.*?>/I Capturing subpattern count = 0 Partial matching not supported No options First char = '<' Need char = '>' abcghinop 0: /<.*>/IU Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = '<' Need char = '>' abcghinop 0: /(?U)<.*>/I Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = '<' Need char = '>' abcghinop 0: /<.*?>/IU Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = '<' Need char = '>' abcghinop 0: ghi /={3,}/IU Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = '=' Need char = '=' abc========def 0: === /(?U)={3,}?/I Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = '=' Need char = '=' abc========def 0: ======== /(?^abc)/Im Capturing subpattern count = 0 Options: multiline First char at start or follows newline Need char = 'c' abc 0: abc def\nabc 0: abc *** Failers No match defabc No match /(?<=ab(c+)d)ef/ Failed: lookbehind assertion is not fixed length at offset 11 /(?<=ab(?<=c+)d)ef/ Failed: lookbehind assertion is not fixed length at offset 12 /(?<=ab(c|de)f)g/ Failed: lookbehind assertion is not fixed length at offset 13 /The next three are in testinput2 because they have variable length branches/ /(?<=bullock|donkey)-cart/I Capturing subpattern count = 0 No options First char = '-' Need char = 't' the bullock-cart 0: -cart a donkey-cart race 0: -cart *** Failers No match cart No match horse-and-cart No match /(?<=ab(?i)x|y|z)/I Capturing subpattern count = 0 No options No first char No need char /(?>.*)(?<=(abcd)|(xyz))/I Capturing subpattern count = 2 Partial matching not supported No options First char at start or follows newline No need char alphabetabcd 0: alphabetabcd 1: abcd endingxyz 0: endingxyz 1: 2: xyz /(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/I Capturing subpattern count = 0 No options First char = 'Z' Need char = 'Z' abxyZZ 0: ZZ abXyZZ 0: ZZ ZZZ 0: ZZ zZZ 0: ZZ bZZ 0: ZZ BZZ 0: ZZ *** Failers No match ZZ No match abXYZZ No match zzz No match bzz No match /(? 3: f 1G a (1) 2G (0) 3G f (1) get substring 4 failed -7 0L adef 1L a 2L 3L f bcdef\G1\G2\G3\G4\L 0: bcdef 1: bc 2: bc 3: f 1G bc (2) 2G bc (2) 3G f (1) get substring 4 failed -7 0L bcdef 1L bc 2L bc 3L f adefghijk\C0 0: adef 1: a 2: 3: f 0C adef (4) /^abc\00def/I Capturing subpattern count = 0 Options: anchored No first char No need char abc\00def\L\C0 0: abc\x00def 0C abc (7) 0L abc /word ((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )((?:[a-zA-Z0-9]+ )?)?)?)?)?)?)?)?)?otherword/I Capturing subpattern count = 8 Partial matching not supported Contains explicit CR or LF match No options First char = 'w' Need char = 'd' /.*X/IDZ ------------------------------------------------------------------ Bra Any* X Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options First char at start or follows newline Need char = 'X' /.*X/IDZs ------------------------------------------------------------------ Bra Any* X Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored dotall No first char Need char = 'X' /(.*X|^B)/IDZ ------------------------------------------------------------------ Bra CBra 1 Any* X Alt ^ B Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Partial matching not supported No options First char at start or follows newline No need char /(.*X|^B)/IDZs ------------------------------------------------------------------ Bra CBra 1 Any* X Alt ^ B Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Partial matching not supported Options: anchored dotall No first char No need char /(?s)(.*X|^B)/IDZ ------------------------------------------------------------------ Bra CBra 1 Any* X Alt ^ B Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Partial matching not supported Options: anchored dotall No first char No need char /(?s:.*X|^B)/IDZ ------------------------------------------------------------------ Bra Bra 04 Opt Any* X Alt 04 Opt ^ B Ket 00 Opt Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options First char at start or follows newline No need char /\Biss\B/I+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /\Biss\B/I+P Mississippi 0: iss 0+ issippi /iss/IG+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi 0: iss 0+ ippi /\Biss\B/IG+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /\Biss\B/Ig+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi 0: iss 0+ ippi *** Failers No match Mississippi\A No match /(?<=[Ms])iss/Ig+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi 0: iss 0+ ippi /(?<=[Ms])iss/IG+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /^iss/Ig+ Capturing subpattern count = 0 Options: anchored No first char No need char ississippi 0: iss 0+ issippi /.*iss/Ig+ Capturing subpattern count = 0 Partial matching not supported No options First char at start or follows newline Need char = 's' abciss\nxyzisspqr 0: abciss 0+ \x0axyzisspqr 0: xyziss 0+ pqr /.i./I+g Capturing subpattern count = 0 No options No first char Need char = 'i' Mississippi 0: Mis 0+ sissippi 0: sis 0+ sippi 0: sip 0+ pi Mississippi\A 0: Mis 0+ sissippi 0: sis 0+ sippi 0: sip 0+ pi Missouri river 0: Mis 0+ souri river 0: ri 0+ river 0: riv 0+ er Missouri river\A 0: Mis 0+ souri river /^.is/I+g Capturing subpattern count = 0 Options: anchored No first char No need char Mississippi 0: Mis 0+ sissippi /^ab\n/Ig+ Capturing subpattern count = 0 Contains explicit CR or LF match Options: anchored No first char No need char ab\nab\ncd 0: ab\x0a 0+ ab\x0acd /^ab\n/Img+ Capturing subpattern count = 0 Contains explicit CR or LF match Options: multiline First char at start or follows newline Need char = 10 ab\nab\ncd 0: ab\x0a 0+ ab\x0acd 0: ab\x0a 0+ cd /abc/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /abc|bac/I Capturing subpattern count = 0 No options No first char Need char = 'c' /(abc|bac)/I Capturing subpattern count = 1 No options No first char Need char = 'c' /(abc|(c|dc))/I Capturing subpattern count = 2 No options No first char Need char = 'c' /(abc|(d|de)c)/I Capturing subpattern count = 2 No options No first char Need char = 'c' /a*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char /a+/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /(baa|a+)/I Capturing subpattern count = 1 Partial matching not supported No options No first char Need char = 'a' /a{0,3}/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char /baa{3,}/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'b' Need char = 'a' /"([^\\"]+|\\.)*"/I Capturing subpattern count = 1 Partial matching not supported No options First char = '"' Need char = '"' /(abc|ab[cd])/I Capturing subpattern count = 1 No options First char = 'a' No need char /(a|.)/I Capturing subpattern count = 1 No options No first char No need char /a|ba|\w/I Capturing subpattern count = 0 No options No first char No need char /abc(?=pqr)/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'r' /...(?<=abc)/I Capturing subpattern count = 0 No options No first char No need char /abc(?!pqr)/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /ab./I Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /ab[xyz]/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /abc*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'b' /ab.c*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'b' /a.c*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /.c*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char /ac*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /(a.c*|b.c*)/I Capturing subpattern count = 1 Partial matching not supported No options No first char No need char /a.c*|aba/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /.+a/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'a' /(?=abcda)a.*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'a' /(?=a)a.*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /a(b)*/I Capturing subpattern count = 1 No options First char = 'a' No need char /a\d*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /ab\d*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'b' /a(\d)*/I Capturing subpattern count = 1 No options First char = 'a' No need char /abcde{0,0}/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'd' /ab\d+/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'b' /a(?(1)b)(.)/I Capturing subpattern count = 1 No options First char = 'a' No need char /a(?(1)bag|big)(.)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'g' /a(?(1)bag|big)*(.)/I Capturing subpattern count = 1 No options First char = 'a' No need char /a(?(1)bag|big)+(.)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'g' /a(?(1)b..|b..)(.)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'b' /ab\d{0}e/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'e' /a?b?/I Capturing subpattern count = 0 No options No first char No need char a 0: a b 0: b ab 0: ab \ 0: *** Failers 0: \N No match /|-/I Capturing subpattern count = 0 No options No first char No need char abcd 0: -abc 0: \Nab-c 0: - *** Failers 0: \Nabc No match /a*(b+)(z)(z)/IP aaaabbbbzzzz 0: aaaabbbbzz 1: bbbb 2: z 3: z aaaabbbbzzzz\O0 aaaabbbbzzzz\O1 0: aaaabbbbzz aaaabbbbzzzz\O2 0: aaaabbbbzz 1: bbbb aaaabbbbzzzz\O3 0: aaaabbbbzz 1: bbbb 2: z aaaabbbbzzzz\O4 0: aaaabbbbzz 1: bbbb 2: z 3: z aaaabbbbzzzz\O5 0: aaaabbbbzz 1: bbbb 2: z 3: z /^.?abcd/IS Capturing subpattern count = 0 Options: anchored No first char Need char = 'd' Study returned NULL /\( # ( at start (?: # Non-capturing bracket (?>[^()]+) # Either a sequence of non-brackets (no backtracking) | # Or (?R) # Recurse - i.e. nested bracketed string )* # Zero or more contents \) # Closing ) /Ix Capturing subpattern count = 0 Partial matching not supported Options: extended First char = '(' Need char = ')' (abcd) 0: (abcd) (abcd)xyz 0: (abcd) xyz(abcd) 0: (abcd) (ab(xy)cd)pqr 0: (ab(xy)cd) (ab(xycd)pqr 0: (xycd) () abc () 0: () 12(abcde(fsh)xyz(foo(bar))lmno)89 0: (abcde(fsh)xyz(foo(bar))lmno) *** Failers No match abcd No match abcd) No match (abcd No match /\( ( (?>[^()]+) | (?R) )* \) /Ixg Capturing subpattern count = 1 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd)pqr 0: (ab(xy)cd) 1: cd 1(abcd)(x(y)z)pqr 0: (abcd) 1: abcd 0: (x(y)z) 1: z /\( (?: (?>[^()]+) | (?R) ) \) /Ix Capturing subpattern count = 0 Partial matching not supported Options: extended First char = '(' Need char = ')' (abcd) 0: (abcd) (ab(xy)cd) 0: (xy) (a(b(c)d)e) 0: (c) ((ab)) 0: ((ab)) *** Failers No match () No match /\( (?: (?>[^()]+) | (?R) )? \) /Ix Capturing subpattern count = 0 Partial matching not supported Options: extended First char = '(' Need char = ')' () 0: () 12(abcde(fsh)xyz(foo(bar))lmno)89 0: (fsh) /\( ( (?>[^()]+) | (?R) )* \) /Ix Capturing subpattern count = 1 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: cd /\( ( ( (?>[^()]+) | (?R) )* ) \) /Ix Capturing subpattern count = 2 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: ab(xy)cd 2: cd /\( (123)? ( ( (?>[^()]+) | (?R) )* ) \) /Ix Capturing subpattern count = 3 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: 2: ab(xy)cd 3: cd (123ab(xy)cd) 0: (123ab(xy)cd) 1: 123 2: ab(xy)cd 3: cd /\( ( (123)? ( (?>[^()]+) | (?R) )* ) \) /Ix Capturing subpattern count = 3 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: ab(xy)cd 2: 3: cd (123ab(xy)cd) 0: (123ab(xy)cd) 1: 123ab(xy)cd 2: 123 3: cd /\( (((((((((( ( (?>[^()]+) | (?R) )* )))))))))) \) /Ix Capturing subpattern count = 11 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: ab(xy)cd 2: ab(xy)cd 3: ab(xy)cd 4: ab(xy)cd 5: ab(xy)cd 6: ab(xy)cd 7: ab(xy)cd 8: ab(xy)cd 9: ab(xy)cd 10: ab(xy)cd 11: cd /\( ( ( (?>[^()<>]+) | ((?>[^()]+)) | (?R) )* ) \) /Ix Capturing subpattern count = 3 Partial matching not supported Options: extended First char = '(' Need char = ')' (abcd(xyz

qrs)123) 0: (abcd(xyz

qrs)123) 1: abcd(xyz

qrs)123 2: 123 3: /\( ( ( (?>[^()]+) | ((?R)) )* ) \) /Ix Capturing subpattern count = 3 Partial matching not supported Options: extended First char = '(' Need char = ')' (ab(cd)ef) 0: (ab(cd)ef) 1: ab(cd)ef 2: ef 3: (cd) (ab(cd(ef)gh)ij) 0: (ab(cd(ef)gh)ij) 1: ab(cd(ef)gh)ij 2: ij 3: (cd(ef)gh) /^[[:alnum:]]/DZ ------------------------------------------------------------------ Bra ^ [0-9A-Za-z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^alnum:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-/:-@[-`{-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:alpha:]]/DZ ------------------------------------------------------------------ Bra ^ [A-Za-z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^alpha:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-@[-`{-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /[_[:alpha:]]/IS Capturing subpattern count = 0 No options No first char No need char Starting byte set: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z _ a b c d e f g h i j k l m n o p q r s t u v w x y z /^[[:ascii:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-\x7f] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^ascii:]]/DZ ------------------------------------------------------------------ Bra ^ [\x80-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:blank:]]/DZ ------------------------------------------------------------------ Bra ^ [\x09 ] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^blank:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-\x08\x0a-\x1f!-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /[\n\x0b\x0c\x0d[:blank:]]/IS Capturing subpattern count = 0 Contains explicit CR or LF match No options No first char No need char Starting byte set: \x09 \x0a \x0b \x0c \x0d \x20 /^[[:cntrl:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-\x1f\x7f] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:digit:]]/DZ ------------------------------------------------------------------ Bra ^ [0-9] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:graph:]]/DZ ------------------------------------------------------------------ Bra ^ [!-~] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:lower:]]/DZ ------------------------------------------------------------------ Bra ^ [a-z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:print:]]/DZ ------------------------------------------------------------------ Bra ^ [ -~] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:punct:]]/DZ ------------------------------------------------------------------ Bra ^ [!-/:-@[-`{-~] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:space:]]/DZ ------------------------------------------------------------------ Bra ^ [\x09-\x0d ] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:upper:]]/DZ ------------------------------------------------------------------ Bra ^ [A-Z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:xdigit:]]/DZ ------------------------------------------------------------------ Bra ^ [0-9A-Fa-f] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:word:]]/DZ ------------------------------------------------------------------ Bra ^ [0-9A-Z_a-z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^cntrl:]]/DZ ------------------------------------------------------------------ Bra ^ [ -~\x80-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[12[:^digit:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-/12:-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^blank:]]/DZ ------------------------------------------------------------------ Bra ^ [\x00-\x08\x0a-\x1f!-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /[01[:alpha:]%]/DZ ------------------------------------------------------------------ Bra [%01A-Za-z] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /[[.ch.]]/I Failed: POSIX collating elements are not supported at offset 1 /[[=ch=]]/I Failed: POSIX collating elements are not supported at offset 1 /[[:rhubarb:]]/I Failed: unknown POSIX class name at offset 3 /[[:upper:]]/Ii Capturing subpattern count = 0 Options: caseless No first char No need char A 0: A a 0: a /[[:lower:]]/Ii Capturing subpattern count = 0 Options: caseless No first char No need char A 0: A a 0: a /((?-i)[[:lower:]])[[:lower:]]/Ii Capturing subpattern count = 1 Options: caseless No first char No need char ab 0: ab 1: a aB 0: aB 1: a *** Failers 0: ai 1: a Ab No match AB No match /[\200-\110]/I Failed: range out of order in character class at offset 9 /^(?(0)f|b)oo/I Failed: invalid condition (?(0) at offset 6 /This one's here because of the large output vector needed/I Capturing subpattern count = 0 No options First char = 'T' Need char = 'd' /(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\d+(?:\s|$))(\w+)\s+(\270)/I Capturing subpattern count = 271 Max back reference = 270 Partial matching not supported No options No first char No need char \O900 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC 0: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 ABC ABC 1: 1 2: 2 3: 3 4: 4 5: 5 6: 6 7: 7 8: 8 9: 9 10: 10 11: 11 12: 12 13: 13 14: 14 15: 15 16: 16 17: 17 18: 18 19: 19 20: 20 21: 21 22: 22 23: 23 24: 24 25: 25 26: 26 27: 27 28: 28 29: 29 30: 30 31: 31 32: 32 33: 33 34: 34 35: 35 36: 36 37: 37 38: 38 39: 39 40: 40 41: 41 42: 42 43: 43 44: 44 45: 45 46: 46 47: 47 48: 48 49: 49 50: 50 51: 51 52: 52 53: 53 54: 54 55: 55 56: 56 57: 57 58: 58 59: 59 60: 60 61: 61 62: 62 63: 63 64: 64 65: 65 66: 66 67: 67 68: 68 69: 69 70: 70 71: 71 72: 72 73: 73 74: 74 75: 75 76: 76 77: 77 78: 78 79: 79 80: 80 81: 81 82: 82 83: 83 84: 84 85: 85 86: 86 87: 87 88: 88 89: 89 90: 90 91: 91 92: 92 93: 93 94: 94 95: 95 96: 96 97: 97 98: 98 99: 99 100: 100 101: 101 102: 102 103: 103 104: 104 105: 105 106: 106 107: 107 108: 108 109: 109 110: 110 111: 111 112: 112 113: 113 114: 114 115: 115 116: 116 117: 117 118: 118 119: 119 120: 120 121: 121 122: 122 123: 123 124: 124 125: 125 126: 126 127: 127 128: 128 129: 129 130: 130 131: 131 132: 132 133: 133 134: 134 135: 135 136: 136 137: 137 138: 138 139: 139 140: 140 141: 141 142: 142 143: 143 144: 144 145: 145 146: 146 147: 147 148: 148 149: 149 150: 150 151: 151 152: 152 153: 153 154: 154 155: 155 156: 156 157: 157 158: 158 159: 159 160: 160 161: 161 162: 162 163: 163 164: 164 165: 165 166: 166 167: 167 168: 168 169: 169 170: 170 171: 171 172: 172 173: 173 174: 174 175: 175 176: 176 177: 177 178: 178 179: 179 180: 180 181: 181 182: 182 183: 183 184: 184 185: 185 186: 186 187: 187 188: 188 189: 189 190: 190 191: 191 192: 192 193: 193 194: 194 195: 195 196: 196 197: 197 198: 198 199: 199 200: 200 201: 201 202: 202 203: 203 204: 204 205: 205 206: 206 207: 207 208: 208 209: 209 210: 210 211: 211 212: 212 213: 213 214: 214 215: 215 216: 216 217: 217 218: 218 219: 219 220: 220 221: 221 222: 222 223: 223 224: 224 225: 225 226: 226 227: 227 228: 228 229: 229 230: 230 231: 231 232: 232 233: 233 234: 234 235: 235 236: 236 237: 237 238: 238 239: 239 240: 240 241: 241 242: 242 243: 243 244: 244 245: 245 246: 246 247: 247 248: 248 249: 249 250: 250 251: 251 252: 252 253: 253 254: 254 255: 255 256: 256 257: 257 258: 258 259: 259 260: 260 261: 261 262: 262 263: 263 264: 264 265: 265 266: 266 267: 267 268: 268 269: 269 270: ABC 271: ABC /This one's here because Perl does this differently and PCRE can't at present/I Capturing subpattern count = 0 No options First char = 'T' Need char = 't' /(main(O)?)+/I Capturing subpattern count = 2 No options First char = 'm' Need char = 'n' mainmain 0: mainmain 1: main mainOmain 0: mainOmain 1: main 2: O /These are all cases where Perl does it differently (nested captures)/I Capturing subpattern count = 1 No options First char = 'T' Need char = 's' /^(a(b)?)+$/I Capturing subpattern count = 2 Options: anchored No first char No need char aba 0: aba 1: a 2: b /^(aa(bb)?)+$/I Capturing subpattern count = 2 Options: anchored No first char No need char aabbaa 0: aabbaa 1: aa 2: bb /^(aa|aa(bb))+$/I Capturing subpattern count = 2 Options: anchored No first char No need char aabbaa 0: aabbaa 1: aa 2: bb /^(aa(bb)??)+$/I Capturing subpattern count = 2 Options: anchored No first char No need char aabbaa 0: aabbaa 1: aa 2: bb /^(?:aa(bb)?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbaa 0: aabbaa 1: bb /^(aa(b(b))?)+$/I Capturing subpattern count = 3 Options: anchored No first char No need char aabbaa 0: aabbaa 1: aa 2: bb 3: b /^(?:aa(b(b))?)+$/I Capturing subpattern count = 2 Options: anchored No first char No need char aabbaa 0: aabbaa 1: bb 2: b /^(?:aa(b(?:b))?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbaa 0: aabbaa 1: bb /^(?:aa(bb(?:b))?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbbaa 0: aabbbaa 1: bbb /^(?:aa(b(?:bb))?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbbaa 0: aabbbaa 1: bbb /^(?:aa(?:b(b))?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbaa 0: aabbaa 1: b /^(?:aa(?:b(bb))?)+$/I Capturing subpattern count = 1 Options: anchored No first char No need char aabbbaa 0: aabbbaa 1: bb /^(aa(b(bb))?)+$/I Capturing subpattern count = 3 Options: anchored No first char No need char aabbbaa 0: aabbbaa 1: aa 2: bbb 3: bb /^(aa(bb(bb))?)+$/I Capturing subpattern count = 3 Options: anchored No first char No need char aabbbbaa 0: aabbbbaa 1: aa 2: bbbb 3: bb /--------------------------------------------------------------------/I Capturing subpattern count = 0 No options First char = '-' Need char = '-' /#/IxDZ ------------------------------------------------------------------ Bra Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: extended No first char No need char /a#/IxDZ ------------------------------------------------------------------ Bra a Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: extended First char = 'a' No need char /[\s]/DZ ------------------------------------------------------------------ Bra [\x09\x0a\x0c\x0d ] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /[\S]/DZ ------------------------------------------------------------------ Bra [\x00-\x08\x0b\x0e-\x1f!-\xff] (neg) Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /a(?i)b/DZ ------------------------------------------------------------------ Bra a 01 Opt NC b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' (caseless) ab 0: ab aB 0: aB *** Failers No match AB No match /(a(?i)b)/DZ ------------------------------------------------------------------ Bra CBra 1 a 01 Opt NC b Ket 00 Opt Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 No options First char = 'a' Need char = 'b' (caseless) ab 0: ab 1: ab aB 0: aB 1: aB *** Failers No match AB No match / (?i)abc/IxDZ ------------------------------------------------------------------ Bra NC abc Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: caseless extended First char = 'a' (caseless) Need char = 'c' (caseless) /#this is a comment (?i)abc/IxDZ ------------------------------------------------------------------ Bra NC abc Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: caseless extended First char = 'a' (caseless) Need char = 'c' (caseless) /123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ ------------------------------------------------------------------ Bra 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = '1' Need char = '0' /\Q123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890/DZ ------------------------------------------------------------------ Bra 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = '1' Need char = '0' /\Q\E/DZ ------------------------------------------------------------------ Bra Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char \ 0: /\Q\Ex/DZ ------------------------------------------------------------------ Bra x Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'x' No need char / \Q\E/DZ ------------------------------------------------------------------ Bra Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = ' ' No need char /a\Q\E/DZ ------------------------------------------------------------------ Bra a Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'a' No need char abc 0: a bca 0: a bac 0: a /a\Q\Eb/DZ ------------------------------------------------------------------ Bra ab Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' abc 0: ab /\Q\Eabc/DZ ------------------------------------------------------------------ Bra abc Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /x*+\w/DZ ------------------------------------------------------------------ Bra x*+ \w Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options No first char No need char *** Failers 0: F xxxxx No match /x?+/DZ ------------------------------------------------------------------ Bra x?+ Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /x++/DZ ------------------------------------------------------------------ Bra x++ Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options First char = 'x' No need char /x{1,3}+/DZ ------------------------------------------------------------------ Bra Once x x{0,2} Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options First char = 'x' No need char /(x)*+/DZ ------------------------------------------------------------------ Bra Once Brazero CBra 1 x KetRmax Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 No options No first char No need char /^(\w++|\s++)*$/I Capturing subpattern count = 1 Partial matching not supported Options: anchored No first char No need char now is the time for all good men to come to the aid of the party 0: now is the time for all good men to come to the aid of the party 1: party *** Failers No match this is not a line with only words and spaces! No match /(\d++)(\w)/I Capturing subpattern count = 2 Partial matching not supported No options No first char No need char 12345a 0: 12345a 1: 12345 2: a *** Failers No match 12345+ No match /a++b/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' Need char = 'b' aaab 0: aaab /(a++b)/I Capturing subpattern count = 1 Partial matching not supported No options First char = 'a' Need char = 'b' aaab 0: aaab 1: aaab /(a++)b/I Capturing subpattern count = 1 Partial matching not supported No options First char = 'a' Need char = 'b' aaab 0: aaab 1: aaa /([^()]++|\([^()]*\))+/I Capturing subpattern count = 1 Partial matching not supported No options No first char No need char ((abc(ade)ufh()()x 0: abc(ade)ufh()()x 1: x /\(([^()]++|\([^()]+\))+\)/I Capturing subpattern count = 1 Partial matching not supported No options First char = '(' Need char = ')' (abc) 0: (abc) 1: abc (abc(def)xyz) 0: (abc(def)xyz) 1: xyz *** Failers No match ((()aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa No match /(abc){1,3}+/DZ ------------------------------------------------------------------ Bra Once CBra 1 abc Ket Brazero Bra CBra 1 abc Ket Brazero CBra 1 abc Ket Ket Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 No options First char = 'a' Need char = 'c' /a+?+/I Failed: nothing to repeat at offset 3 /a{2,3}?+b/I Failed: nothing to repeat at offset 7 /(?U)a+?+/I Failed: nothing to repeat at offset 7 /a{2,3}?+b/IU Failed: nothing to repeat at offset 7 /x(?U)a++b/DZ ------------------------------------------------------------------ Bra x a++ b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options First char = 'x' Need char = 'b' xaaaab 0: xaaaab /(?U)xa++b/DZ ------------------------------------------------------------------ Bra x a++ b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: ungreedy First char = 'x' Need char = 'b' xaaaab 0: xaaaab /^((a+)(?U)([ab]+)(?-U)([bc]+)(\w*))/DZ ------------------------------------------------------------------ Bra ^ CBra 1 CBra 2 a+ Ket CBra 3 [ab]+? Ket CBra 4 [bc]+ Ket CBra 5 \w* Ket Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 5 Partial matching not supported Options: anchored No first char No need char /^x(?U)a+b/DZ ------------------------------------------------------------------ Bra ^ x a++ b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored No first char Need char = 'b' /^x(?U)(a+)b/DZ ------------------------------------------------------------------ Bra ^ x CBra 1 a+? Ket b Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Partial matching not supported Options: anchored No first char Need char = 'b' /[.x.]/I Failed: POSIX collating elements are not supported at offset 0 /[=x=]/I Failed: POSIX collating elements are not supported at offset 0 /[:x:]/I Failed: POSIX named classes are supported only within a class at offset 0 /\l/I Failed: PCRE does not support \L, \l, \N, \U, or \u at offset 1 /\L/I Failed: PCRE does not support \L, \l, \N, \U, or \u at offset 1 /\N{name}/I Failed: PCRE does not support \L, \l, \N, \U, or \u at offset 1 /\u/I Failed: PCRE does not support \L, \l, \N, \U, or \u at offset 1 /\U/I Failed: PCRE does not support \L, \l, \N, \U, or \u at offset 1 /[/I Failed: missing terminating ] for character class at offset 1 /[a-/I Failed: missing terminating ] for character class at offset 3 /[[:space:]/I Failed: missing terminating ] for character class at offset 10 /[\s]/IDZ ------------------------------------------------------------------ Bra [\x09\x0a\x0c\x0d ] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /[[:space:]]/IDZ ------------------------------------------------------------------ Bra [\x09-\x0d ] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /[[:space:]abcde]/IDZ ------------------------------------------------------------------ Bra [\x09-\x0d a-e] Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /< (?: (?(R) \d++ | [^<>]*+) | (?R)) * >/Ix Capturing subpattern count = 0 Partial matching not supported Options: extended First char = '<' Need char = '>' <> 0: <> 0: hij> 0: hij> hij> 0: def> 0: def> 0: <> *** Failers No match iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|IDZ ------------------------------------------------------------------ Bra 8J$WE<.rX+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDDqmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:x9'c[%z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X \b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = '8' Need char = 'X' |\$\<\.X\+ix\[d1b\!H\#\?vV0vrK\:ZH1\=2M\>iV\;\?aPhFB\<\*vW\@QW\@sO9\}cfZA\-i\'w\%hKd6gt1UJP\,15_\#QY\$M\^Mss_U\/\]\&LK9\[5vQub\^w\[KDD\qmj\;2\}YWFdYx\.Ap\]hjCPTP\(n28k\+3\;o\&WXqs\/gOXdr\$\:r\'do0\;b4c\(f_Gr\=\"\\4\)\[01T7ajQJvL\$W\~mL_sS\/4h\:x\*\[ZN\=KLs\&L5zX\/\/\>it\,o\:aU\(\;Z\>pW\&T7oP\'2K\^E\:x9\'c\[\%z\-\,64JQ5AeH_G\#KijUKghQw\^\\vea3a\?kka_G\$8\#\`\*kynsxzBLru\'\]k_\[7FrVx\}\^\=\$blx\>s\-N\%j\;D\*aZDnsw\:YKZ\%Q\.Kne9\#hP\?\+b3\(SOvL\,\^\;\&u5\@\?5C5Bhb\=m\-vEh_L15Jl\]U\)0RP6\{q\%L\^_z5E\'Dw6X\b|IDZ ------------------------------------------------------------------ Bra $<.X+ix[d1b!H#?vV0vrK:ZH1=2M>iV;?aPhFB<*vW@QW@sO9}cfZA-i'w%hKd6gt1UJP,15_#QY$M^Mss_U/]&LK9[5vQub^w[KDDqmj;2}YWFdYx.Ap]hjCPTP(n28k+3;o&WXqs/gOXdr$:r'do0;b4c(f_Gr="\4)[01T7ajQJvL$W~mL_sS/4h:x*[ZN=KLs&L5zX//>it,o:aU(;Z>pW&T7oP'2K^E:x9'c[%z-,64JQ5AeH_G#KijUKghQw^\vea3a?kka_G$8#`*kynsxzBLru']k_[7FrVx}^=$blx>s-N%j;D*aZDnsw:YKZ%Q.Kne9#hP?+b3(SOvL,^;&u5@?5C5Bhb=m-vEh_L15Jl]U)0RP6{q%L^_z5E'Dw6X \b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = '$' Need char = 'X' /(.*)\d+\1/I Capturing subpattern count = 1 Max back reference = 1 Partial matching not supported No options No first char No need char /(.*)\d+/I Capturing subpattern count = 1 Partial matching not supported No options First char at start or follows newline No need char /(.*)\d+\1/Is Capturing subpattern count = 1 Max back reference = 1 Partial matching not supported Options: dotall No first char No need char /(.*)\d+/Is Capturing subpattern count = 1 Partial matching not supported Options: anchored dotall No first char No need char /(.*(xyz))\d+\2/I Capturing subpattern count = 2 Max back reference = 2 Partial matching not supported No options First char at start or follows newline Need char = 'z' /((.*))\d+\1/I Capturing subpattern count = 2 Max back reference = 1 Partial matching not supported No options No first char No need char abc123bc 0: bc123bc 1: bc 2: bc /a[b]/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /(?=a).*/I Capturing subpattern count = 0 Partial matching not supported No options First char = 'a' No need char /(?=abc).xyz/IiI Capturing subpattern count = 0 Options: caseless First char = 'a' (caseless) Need char = 'z' (caseless) /(?=abc)(?i).xyz/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'z' (caseless) /(?=a)(?=b)/I Capturing subpattern count = 0 No options First char = 'a' No need char /(?=.)a/I Capturing subpattern count = 0 No options First char = 'a' No need char /((?=abcda)a)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'a' /((?=abcda)ab)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'b' /()a/I Capturing subpattern count = 1 No options No first char Need char = 'a' /(?(1)ab|ac)(.)/I Capturing subpattern count = 1 No options First char = 'a' No need char /(?(1)abz|acz)(.)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'z' /(?(1)abz)(.)/I Capturing subpattern count = 1 No options No first char No need char /(?(1)abz)(1)23/I Capturing subpattern count = 1 No options No first char Need char = '3' /(a)+/I Capturing subpattern count = 1 No options First char = 'a' No need char /(a){2,3}/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'a' /(a)*/I Capturing subpattern count = 1 No options No first char No need char /[a]/I Capturing subpattern count = 0 No options First char = 'a' No need char /[ab]/I Capturing subpattern count = 0 No options No first char No need char /[ab]/IS Capturing subpattern count = 0 No options No first char No need char Starting byte set: a b /[^a]/I Capturing subpattern count = 0 No options No first char No need char /\d456/I Capturing subpattern count = 0 No options No first char Need char = '6' /\d456/IS Capturing subpattern count = 0 No options No first char Need char = '6' Starting byte set: 0 1 2 3 4 5 6 7 8 9 /a^b/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /^a/Im Capturing subpattern count = 0 Options: multiline First char at start or follows newline Need char = 'a' abcde 0: a xy\nabc 0: a *** Failers No match xyabc No match /c|abc/I Capturing subpattern count = 0 No options No first char Need char = 'c' /(?i)[ab]/IS Capturing subpattern count = 0 Options: caseless No first char No need char Starting byte set: A B a b /[ab](?i)cd/IS Capturing subpattern count = 0 No options No first char Need char = 'd' (caseless) Starting byte set: a b /abc(?C)def/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'f' abcdef --->abcdef 0 ^ ^ d 0: abcdef 1234abcdef --->1234abcdef 0 ^ ^ d 0: abcdef *** Failers No match abcxyz No match abcxyzf --->abcxyzf 0 ^ ^ d No match /abc(?C)de(?C1)f/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'f' 123abcdef --->123abcdef 0 ^ ^ d 1 ^ ^ f 0: abcdef /(?C1)\dabc(?C2)def/I Capturing subpattern count = 0 No options No first char Need char = 'f' 1234abcdef --->1234abcdef 1 ^ \d 1 ^ \d 1 ^ \d 1 ^ \d 2 ^ ^ d 0: 4abcdef *** Failers No match abcdef --->abcdef 1 ^ \d 1 ^ \d 1 ^ \d 1 ^ \d 1 ^ \d 1 ^ \d No match /(?C255)ab/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /(?C256)ab/I Failed: number after (?C is > 255 at offset 6 /(?Cab)xx/I Failed: closing ) for (?C expected at offset 3 /(?C12vr)x/I Failed: closing ) for (?C expected at offset 5 /abc(?C)def/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'f' *** Failers No match \x83\x0\x61bcdef --->\x83\x00abcdef 0 ^ ^ d 0: abcdef /(abc)(?C)de(?C1)f/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'f' 123abcdef --->123abcdef 0 ^ ^ d 1 ^ ^ f 0: abcdef 1: abc 123abcdef\C+ Callout 0: last capture = 1 0: 1: abc --->123abcdef ^ ^ d Callout 1: last capture = 1 0: 1: abc --->123abcdef ^ ^ f 0: abcdef 1: abc 123abcdef\C- 0: abcdef 1: abc *** Failers No match 123abcdef\C!1 --->123abcdef 0 ^ ^ d 1 ^ ^ f No match /(?C0)(abc(?C1))*/I Capturing subpattern count = 1 No options No first char No need char abcabcabc --->abcabcabc 0 ^ (abc(?C1))* 1 ^ ^ ) 1 ^ ^ ) 1 ^ ^ ) 0: abcabcabc 1: abc abcabc\C!1!3 --->abcabc 0 ^ (abc(?C1))* 1 ^ ^ ) 1 ^ ^ ) 0: abcabc 1: abc *** Failers --->*** Failers 0 ^ (abc(?C1))* 0: abcabcabc\C!1!3 --->abcabcabc 0 ^ (abc(?C1))* 1 ^ ^ ) 1 ^ ^ ) 1 ^ ^ ) 0: abcabc 1: abc /(\d{3}(?C))*/I Capturing subpattern count = 1 Partial matching not supported No options No first char No need char 123\C+ Callout 0: last capture = -1 0: --->123 ^ ^ ) 0: 123 1: 123 123456\C+ Callout 0: last capture = -1 0: --->123456 ^ ^ ) Callout 0: last capture = 1 0: 1: 123 --->123456 ^ ^ ) 0: 123456 1: 456 123456789\C+ Callout 0: last capture = -1 0: --->123456789 ^ ^ ) Callout 0: last capture = 1 0: 1: 123 --->123456789 ^ ^ ) Callout 0: last capture = 1 0: 1: 456 --->123456789 ^ ^ ) 0: 123456789 1: 789 /((xyz)(?C)p|(?C1)xyzabc)/I Capturing subpattern count = 2 No options First char = 'x' No need char xyzabc\C+ Callout 0: last capture = 2 0: 1: 2: xyz --->xyzabc ^ ^ p Callout 1: last capture = -1 0: --->xyzabc ^ x 0: xyzabc 1: xyzabc /(X)((xyz)(?C)p|(?C1)xyzabc)/I Capturing subpattern count = 3 No options First char = 'X' Need char = 'x' Xxyzabc\C+ Callout 0: last capture = 3 0: 1: X 2: 3: xyz --->Xxyzabc ^ ^ p Callout 1: last capture = 1 0: 1: X --->Xxyzabc ^^ x 0: Xxyzabc 1: X 2: xyzabc /(?=(abc))(?C)abcdef/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'f' abcdef\C+ Callout 0: last capture = 1 0: 1: abc --->abcdef ^ a 0: abcdef 1: abc /(?!(abc)(?C1)d)(?C2)abcxyz/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'z' abcxyz\C+ Callout 1: last capture = 1 0: 1: abc --->abcxyz ^ ^ d Callout 2: last capture = -1 0: --->abcxyz ^ a 0: abcxyz /(?<=(abc)(?C))xyz/I Capturing subpattern count = 1 No options First char = 'x' Need char = 'z' abcxyz\C+ Callout 0: last capture = 1 0: 1: abc --->abcxyz ^ ) 0: xyz 1: abc /a(b+)(c*)(?C1)/I Capturing subpattern count = 2 Partial matching not supported No options First char = 'a' Need char = 'b' abbbbbccc\C*1 --->abbbbbccc 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 No match /a(b+?)(c*?)(?C1)/I Capturing subpattern count = 2 Partial matching not supported No options First char = 'a' Need char = 'b' abbbbbccc\C*1 --->abbbbbccc 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 1 ^ ^ Callout data = 1 No match /(?C)abc/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /(?C)^abc/I Capturing subpattern count = 0 Options: anchored No first char No need char /(?C)a|b/IS Capturing subpattern count = 0 No options No first char No need char Starting byte set: a b /(?R)/I Failed: recursive call could loop indefinitely at offset 3 /(a|(?R))/I Failed: recursive call could loop indefinitely at offset 6 /(ab|(bc|(de|(?R))))/I Failed: recursive call could loop indefinitely at offset 15 /x(ab|(bc|(de|(?R))))/I Capturing subpattern count = 3 No options First char = 'x' No need char xab 0: xab 1: ab xbc 0: xbc 1: bc 2: bc xde 0: xde 1: de 2: de 3: de xxab 0: xxab 1: xab 2: xab 3: xab xxxab 0: xxxab 1: xxab 2: xxab 3: xxab *** Failers No match xyab No match /(ab|(bc|(de|(?1))))/I Failed: recursive call could loop indefinitely at offset 15 /x(ab|(bc|(de|(?1)x)x)x)/I Failed: recursive call could loop indefinitely at offset 16 /^([^()]|\((?1)*\))*$/I Capturing subpattern count = 1 Options: anchored No first char No need char abc 0: abc 1: c a(b)c 0: a(b)c 1: c a(b(c))d 0: a(b(c))d 1: d *** Failers) No match a(b(c)d No match /^>abc>([^()]|\((?1)*\))*abc>123abc>123abc>1(2)3abc>1(2)3abc>(1(2)3)abc>(1(2)3) 2: 3: Satan, oscillate my metallic sonatas 4: S A man, a plan, a canal: Panama! 0: A man, a plan, a canal: Panama! 1: 2: 3: A man, a plan, a canal: Panama 4: A Able was I ere I saw Elba. 0: Able was I ere I saw Elba. 1: 2: 3: Able was I ere I saw Elba 4: A *** Failers No match The quick brown fox No match /^(\d+|\((?1)([+*-])(?1)\)|-(?1))$/I Capturing subpattern count = 2 Partial matching not supported Options: anchored No first char No need char 12 0: 12 1: 12 (((2+2)*-3)-7) 0: (((2+2)*-3)-7) 1: (((2+2)*-3)-7) 2: - -12 0: -12 1: -12 *** Failers No match ((2+2)*-3)-7) No match /^(x(y|(?1){2})z)/I Capturing subpattern count = 2 Options: anchored No first char No need char xyz 0: xyz 1: xyz 2: y xxyzxyzz 0: xxyzxyzz 1: xxyzxyzz 2: xyzxyz *** Failers No match xxyzz No match xxyzxyzxyzz No match /((< (?: (?(R) \d++ | [^<>]*+) | (?2)) * >))/Ix Capturing subpattern count = 2 Partial matching not supported Options: extended First char = '<' Need char = '>' <> 0: <> 1: <> 2: <> 0: 1: 2: hij> 0: hij> 1: hij> 2: hij> hij> 0: 1: 2: def> 0: def> 1: def> 2: def> 0: <> 1: <> 2: <> *** Failers No match b|c)d(?Pe)/DZ ------------------------------------------------------------------ Bra a CBra 1 b Alt c Ket d CBra 2 e Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 Named capturing subpatterns: longername2 2 name1 1 No options First char = 'a' Need char = 'e' abde 0: abde 1: b 2: e acde 0: acde 1: c 2: e /(?:a(?Pc(?Pd)))(?Pa)/DZ ------------------------------------------------------------------ Bra Bra a CBra 1 c CBra 2 d Ket Ket Ket CBra 3 a Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 3 Named capturing subpatterns: a 3 c 1 d 2 No options First char = 'a' Need char = 'a' /(?Pa)...(?P=a)bbb(?P>a)d/DZ ------------------------------------------------------------------ Bra CBra 1 a Ket Any Any Any \1 bbb Once Recurse Ket d Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Max back reference = 1 Named capturing subpatterns: a 1 No options First char = 'a' Need char = 'd' /^\W*(?:(?P(?P.)\W*(?P>one)\W*(?P=two)|)|(?P(?P.)\W*(?P>three)\W*(?P=four)|\W*.\W*))\W*$/Ii Capturing subpattern count = 4 Max back reference = 4 Named capturing subpatterns: four 4 one 1 three 3 two 2 Partial matching not supported Options: anchored caseless No first char No need char 1221 0: 1221 1: 1221 2: 1 Satan, oscillate my metallic sonatas! 0: Satan, oscillate my metallic sonatas! 1: 2: 3: Satan, oscillate my metallic sonatas 4: S A man, a plan, a canal: Panama! 0: A man, a plan, a canal: Panama! 1: 2: 3: A man, a plan, a canal: Panama 4: A Able was I ere I saw Elba. 0: Able was I ere I saw Elba. 1: 2: 3: Able was I ere I saw Elba 4: A *** Failers No match The quick brown fox No match /((?(R)a|b))\1(?1)?/I Capturing subpattern count = 1 Max back reference = 1 No options No first char No need char bb 0: bb 1: b bbaa 0: bba 1: b /(.*)a/Is Capturing subpattern count = 1 Partial matching not supported Options: anchored dotall No first char Need char = 'a' /(.*)a\1/Is Capturing subpattern count = 1 Max back reference = 1 Partial matching not supported Options: dotall No first char Need char = 'a' /(.*)a(b)\2/Is Capturing subpattern count = 2 Max back reference = 2 Partial matching not supported Options: anchored dotall No first char Need char = 'b' /((.*)a|(.*)b)z/Is Capturing subpattern count = 3 Partial matching not supported Options: anchored dotall No first char Need char = 'z' /((.*)a|(.*)b)z\1/Is Capturing subpattern count = 3 Max back reference = 1 Partial matching not supported Options: dotall No first char Need char = 'z' /((.*)a|(.*)b)z\2/Is Capturing subpattern count = 3 Max back reference = 2 Partial matching not supported Options: dotall No first char Need char = 'z' /((.*)a|(.*)b)z\3/Is Capturing subpattern count = 3 Max back reference = 3 Partial matching not supported Options: dotall No first char Need char = 'z' /((.*)a|^(.*)b)z\3/Is Capturing subpattern count = 3 Max back reference = 3 Partial matching not supported Options: anchored dotall No first char Need char = 'z' /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a/Is Capturing subpattern count = 31 Partial matching not supported Options: anchored dotall No first char No need char /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\31/Is Capturing subpattern count = 31 Max back reference = 31 Partial matching not supported Options: dotall No first char No need char /(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)|(.*)a\32/Is Capturing subpattern count = 32 Max back reference = 32 Partial matching not supported Options: dotall No first char No need char /(a)(bc)/INDZ ------------------------------------------------------------------ Bra Bra a Ket Bra bc Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: no_auto_capture First char = 'a' Need char = 'c' abc 0: abc /(?Pa)(bc)/INDZ ------------------------------------------------------------------ Bra CBra 1 a Ket Bra bc Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Named capturing subpatterns: one 1 Options: no_auto_capture First char = 'a' Need char = 'c' abc 0: abc 1: a /(a)(?Pbc)/INDZ ------------------------------------------------------------------ Bra Bra a Ket CBra 1 bc Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Named capturing subpatterns: named 1 Options: no_auto_capture First char = 'a' Need char = 'c' /(a+)*zz/I Capturing subpattern count = 1 Partial matching not supported No options No first char Need char = 'z' aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazzbbbbbb\M Minimum match() limit = 8 Minimum match() recursion limit = 6 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaazz 1: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaz\M Minimum match() limit = 32768 Minimum match() recursion limit = 42 No match /(aaa(?C1)bbb|ab)/I Capturing subpattern count = 1 No options First char = 'a' Need char = 'b' aaabbb --->aaabbb 1 ^ ^ b 0: aaabbb 1: aaabbb aaabbb\C*0 --->aaabbb 1 ^ ^ b 0: aaabbb 1: aaabbb aaabbb\C*1 --->aaabbb 1 ^ ^ b Callout data = 1 0: ab 1: ab aaabbb\C*-1 --->aaabbb 1 ^ ^ b Callout data = -1 No match /ab(?Pcd)ef(?Pgh)/I Capturing subpattern count = 2 Named capturing subpatterns: one 1 two 2 No options First char = 'a' Need char = 'h' abcdefgh 0: abcdefgh 1: cd 2: gh abcdefgh\C1\Gtwo 0: abcdefgh 1: cd 2: gh 1C cd (2) G gh (2) two abcdefgh\Cone\Ctwo 0: abcdefgh 1: cd 2: gh C cd (2) one C gh (2) two abcdefgh\Cthree no parentheses with name "three" 0: abcdefgh 1: cd 2: gh copy substring three failed -7 /(?P)(?P)/DZ ------------------------------------------------------------------ Bra CBra 1 Ket CBra 2 Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 Named capturing subpatterns: Tes 1 Test 2 No options No first char No need char /(?P)(?P)/DZ ------------------------------------------------------------------ Bra CBra 1 Ket CBra 2 Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 Named capturing subpatterns: Tes 2 Test 1 No options No first char No need char /(?Pzz)(?Paa)/I Capturing subpattern count = 2 Named capturing subpatterns: A 2 Z 1 No options First char = 'z' Need char = 'a' zzaa\CZ 0: zzaa 1: zz 2: aa C zz (2) Z zzaa\CA 0: zzaa 1: zz 2: aa C aa (2) A /(?Peks)(?Peccs)/I Failed: two named subpatterns have the same name at offset 15 /(?Pabc(?Pdef)(?Pxyz))/I Failed: two named subpatterns have the same name at offset 30 "\[((?P\d+)(,(?P>elem))*)\]"I Capturing subpattern count = 3 Named capturing subpatterns: elem 2 Partial matching not supported No options First char = '[' Need char = ']' [10,20,30,5,5,4,4,2,43,23,4234] 0: [10,20,30,5,5,4,4,2,43,23,4234] 1: 10,20,30,5,5,4,4,2,43,23,4234 2: 10 3: ,4234 *** Failers No match [] No match "\[((?P\d+)(,(?P>elem))*)?\]"I Capturing subpattern count = 3 Named capturing subpatterns: elem 2 Partial matching not supported No options First char = '[' Need char = ']' [10,20,30,5,5,4,4,2,43,23,4234] 0: [10,20,30,5,5,4,4,2,43,23,4234] 1: 10,20,30,5,5,4,4,2,43,23,4234 2: 10 3: ,4234 [] 0: [] /(a(b(?2)c))?/DZ ------------------------------------------------------------------ Bra Brazero CBra 1 a CBra 2 b Once Recurse Ket c Ket Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 No options No first char No need char /(a(b(?2)c))*/DZ ------------------------------------------------------------------ Bra Brazero CBra 1 a CBra 2 b Once Recurse Ket c Ket KetRmax Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 No options No first char No need char /(a(b(?2)c)){0,2}/DZ ------------------------------------------------------------------ Bra Brazero Bra CBra 1 a CBra 2 b Once Recurse Ket c Ket Ket Brazero CBra 1 a CBra 2 b Once Recurse Ket c Ket Ket Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 2 No options No first char No need char /[ab]{1}+/DZ ------------------------------------------------------------------ Bra Once [ab]{1,1} Ket Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/Ii Capturing subpattern count = 3 Partial matching not supported Options: caseless No first char Need char = 'g' (caseless) Baby Bjorn Active Carrier - With free SHIPPING!! 0: Baby Bjorn Active Carrier - With free SHIPPING!! 1: Baby Bjorn Active Carrier - With free SHIPPING!! /((w\/|-|with)*(free|immediate)*.*?shipping\s*[!.-]*)/IiS Capturing subpattern count = 3 Partial matching not supported Options: caseless No first char Need char = 'g' (caseless) Study returned NULL Baby Bjorn Active Carrier - With free SHIPPING!! 0: Baby Bjorn Active Carrier - With free SHIPPING!! 1: Baby Bjorn Active Carrier - With free SHIPPING!! /a*.*b/ISDZ ------------------------------------------------------------------ Bra a* Any* b Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'b' Study returned NULL /(a|b)*.?c/ISDZ ------------------------------------------------------------------ Bra Brazero CBra 1 a Alt b KetRmax Any? c Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 No options No first char Need char = 'c' Study returned NULL /abc(?C255)de(?C)f/DZ ------------------------------------------------------------------ Bra abc Callout 255 10 1 de Callout 0 16 1 f Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char = 'a' Need char = 'f' /abcde/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 1 a Callout 255 1 1 b Callout 255 2 1 c Callout 255 3 1 d Callout 255 4 1 e Callout 255 5 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: First char = 'a' Need char = 'e' abcde --->abcde +0 ^ a +1 ^^ b +2 ^ ^ c +3 ^ ^ d +4 ^ ^ e +5 ^ ^ 0: abcde abcdfe --->abcdfe +0 ^ a +1 ^^ b +2 ^ ^ c +3 ^ ^ d +4 ^ ^ e No match /a*b/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 2 a*+ Callout 255 2 1 b Callout 255 3 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: No first char Need char = 'b' ab --->ab +0 ^ a* +2 ^^ b +3 ^ ^ 0: ab aaaab --->aaaab +0 ^ a* +2 ^ ^ b +3 ^ ^ 0: aaaab aaaacb --->aaaacb +0 ^ a* +2 ^ ^ b +0 ^ a* +2 ^ ^ b +0 ^ a* +2 ^ ^ b +0 ^ a* +2 ^^ b +0 ^ a* +2 ^ b +0 ^ a* +2 ^ b +3 ^^ 0: b /a+b/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 2 a++ Callout 255 2 1 b Callout 255 3 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: First char = 'a' Need char = 'b' ab --->ab +0 ^ a+ +2 ^^ b +3 ^ ^ 0: ab aaaab --->aaaab +0 ^ a+ +2 ^ ^ b +3 ^ ^ 0: aaaab aaaacb --->aaaacb +0 ^ a+ +2 ^ ^ b +0 ^ a+ +2 ^ ^ b +0 ^ a+ +2 ^ ^ b +0 ^ a+ +2 ^^ b No match /(abc|def)x/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 9 CBra 1 Callout 255 1 1 a Callout 255 2 1 b Callout 255 3 1 c Callout 255 4 0 Alt Callout 255 5 1 d Callout 255 6 1 e Callout 255 7 1 f Callout 255 8 0 Ket Callout 255 9 1 x Callout 255 10 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Options: No first char Need char = 'x' abcx --->abcx +0 ^ (abc|def) +1 ^ a +2 ^^ b +3 ^ ^ c +4 ^ ^ | +9 ^ ^ x +10 ^ ^ 0: abcx 1: abc defx --->defx +0 ^ (abc|def) +1 ^ a +5 ^ d +6 ^^ e +7 ^ ^ f +8 ^ ^ ) +9 ^ ^ x +10 ^ ^ 0: defx 1: def abcdefzx --->abcdefzx +0 ^ (abc|def) +1 ^ a +2 ^^ b +3 ^ ^ c +4 ^ ^ | +9 ^ ^ x +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d +6 ^^ e +7 ^ ^ f +8 ^ ^ ) +9 ^ ^ x +0 ^ (abc|def) +1 ^ a +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d +0 ^ (abc|def) +1 ^ a +5 ^ d No match /(ab|cd){3,4}/IC Capturing subpattern count = 1 Options: No first char No need char ababab --->ababab +0 ^ (ab|cd){3,4} +1 ^ a +2 ^^ b +3 ^ ^ | +1 ^ ^ a +2 ^ ^ b +3 ^ ^ | +1 ^ ^ a +2 ^ ^ b +3 ^ ^ | +1 ^ ^ a +4 ^ ^ c +12 ^ ^ 0: ababab 1: ab abcdabcd --->abcdabcd +0 ^ (ab|cd){3,4} +1 ^ a +2 ^^ b +3 ^ ^ | +1 ^ ^ a +4 ^ ^ c +5 ^ ^ d +6 ^ ^ ) +1 ^ ^ a +2 ^ ^ b +3 ^ ^ | +1 ^ ^ a +4 ^ ^ c +5 ^ ^ d +6 ^ ^ ) +12 ^ ^ 0: abcdabcd 1: cd abcdcdcdcdcd --->abcdcdcdcdcd +0 ^ (ab|cd){3,4} +1 ^ a +2 ^^ b +3 ^ ^ | +1 ^ ^ a +4 ^ ^ c +5 ^ ^ d +6 ^ ^ ) +1 ^ ^ a +4 ^ ^ c +5 ^ ^ d +6 ^ ^ ) +1 ^ ^ a +4 ^ ^ c +5 ^ ^ d +6 ^ ^ ) +12 ^ ^ 0: abcdcdcd 1: cd /([ab]{,4}c|xy)/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 14 CBra 1 Callout 255 1 4 [ab] Callout 255 5 1 { Callout 255 6 1 , Callout 255 7 1 4 Callout 255 8 1 } Callout 255 9 1 c Callout 255 10 0 Alt Callout 255 11 1 x Callout 255 12 1 y Callout 255 13 0 Ket Callout 255 14 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Options: No first char No need char Note: that { does NOT introduce a quantifier --->Note: that { does NOT introduce a quantifier +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +5 ^^ { +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +5 ^^ { +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +5 ^^ { +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x +0 ^ ([ab]{,4}c|xy) +1 ^ [ab] +11 ^ x No match /([ab]{1,4}c|xy){4,5}?123/ICDZ ------------------------------------------------------------------ Bra Callout 255 0 21 CBra 1 Callout 255 1 9 [ab]{1,4} Callout 255 10 1 c Callout 255 11 0 Alt Callout 255 12 1 x Callout 255 13 1 y Callout 255 14 0 Ket CBra 1 Callout 255 1 9 [ab]{1,4} Callout 255 10 1 c Callout 255 11 0 Alt Callout 255 12 1 x Callout 255 13 1 y Callout 255 14 0 Ket CBra 1 Callout 255 1 9 [ab]{1,4} Callout 255 10 1 c Callout 255 11 0 Alt Callout 255 12 1 x Callout 255 13 1 y Callout 255 14 0 Ket CBra 1 Callout 255 1 9 [ab]{1,4} Callout 255 10 1 c Callout 255 11 0 Alt Callout 255 12 1 x Callout 255 13 1 y Callout 255 14 0 Ket Braminzero CBra 1 Callout 255 1 9 [ab]{1,4} Callout 255 10 1 c Callout 255 11 0 Alt Callout 255 12 1 x Callout 255 13 1 y Callout 255 14 0 Ket Callout 255 21 1 1 Callout 255 22 1 2 Callout 255 23 1 3 Callout 255 24 0 Ket End ------------------------------------------------------------------ Capturing subpattern count = 1 Partial matching not supported Options: No first char Need char = '3' aacaacaacaacaac123 --->aacaacaacaacaac123 +0 ^ ([ab]{1,4}c|xy){4,5}? +1 ^ [ab]{1,4} +10 ^ ^ c +11 ^ ^ | +1 ^ ^ [ab]{1,4} +10 ^ ^ c +11 ^ ^ | +1 ^ ^ [ab]{1,4} +10 ^ ^ c +11 ^ ^ | +1 ^ ^ [ab]{1,4} +10 ^ ^ c +11 ^ ^ | +21 ^ ^ 1 +1 ^ ^ [ab]{1,4} +10 ^ ^ c +11 ^ ^ | +21 ^ ^ 1 +22 ^ ^ 2 +23 ^ ^ 3 +24 ^ ^ 0: aacaacaacaacaac123 1: aac /\b.*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char ab cd\>1 0: cd /\b.*/Is Capturing subpattern count = 0 Partial matching not supported Options: dotall No first char No need char ab cd\>1 0: cd /(?!.bcd).*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char Xbcd12345 0: bcd12345 /abcde/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'e' ab\P Partial match abc\P Partial match abcd\P Partial match abcde\P 0: abcde the quick brown abc\P Partial match ** Failers\P No match the quick brown abxyz fox\P No match "^(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/(20)?\d\d$"I Capturing subpattern count = 3 Options: anchored No first char Need char = '/' 13/05/04\P 0: 13/05/04 1: 13 2: 05 13/5/2004\P 0: 13/5/2004 1: 13 2: 5 3: 20 02/05/09\P 0: 02/05/09 1: 02 2: 05 1\P Partial match 1/2\P Partial match 1/2/0\P Partial match 1/2/04\P 0: 1/2/04 1: 1 2: 2 0\P Partial match 02/\P Partial match 02/0\P Partial match 02/1\P Partial match ** Failers\P No match \P No match 123\P No match 33/4/04\P No match 3/13/04\P No match 0/1/2003\P No match 0/\P No match 02/0/\P No match 02/13\P No match /0{0,2}ABC/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'C' /\d{3,}ABC/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'C' /\d*ABC/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'C' /[abc]+DE/I Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = 'E' /[abc]?123/I Capturing subpattern count = 0 No options No first char Need char = '3' 123\P 0: 123 a\P Partial match b\P Partial match c\P Partial match c12\P Partial match c123\P 0: c123 /^(?:\d){3,5}X/I Capturing subpattern count = 0 Options: anchored No first char Need char = 'X' 1\P Partial match 123\P Partial match 123X 0: 123X 1234\P Partial match 1234X 0: 1234X 12345\P Partial match 12345X 0: 12345X *** Failers No match 1X No match 123456\P No match /abc/I>testsavedregex Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' Compiled regex written to testsavedregex testsavedregex Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' Compiled regex written to testsavedregex testsavedregex Capturing subpattern count = 1 No options No first char No need char Starting byte set: a b Compiled regex written to testsavedregex Study data written to testsavedregex testsavedregex Capturing subpattern count = 1 No options No first char No need char Starting byte set: a b Compiled regex written to testsavedregex Study data written to testsavedregex (.)*~smgI Capturing subpattern count = 3 Max back reference = 1 Partial matching not supported Options: multiline dotall First char = '<' Need char = '>' \n\n\nPartner der LCO\nde\nPartner der LINEAS Consulting\nGmbH\nLINEAS Consulting GmbH Hamburg\nPartnerfirmen\n30 days\nindex,follow\n\nja\n3\nPartner\n\n\nLCO\nLINEAS Consulting\n15.10.2003\n\n\n\n\nDie Partnerfirmen der LINEAS Consulting\nGmbH\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n 0: \x0a\x0aPartner der LCO\x0ade\x0aPartner der LINEAS Consulting\x0aGmbH\x0aLINEAS Consulting GmbH Hamburg\x0aPartnerfirmen\x0a30 days\x0aindex,follow\x0a\x0aja\x0a3\x0aPartner\x0a\x0a\x0aLCO\x0aLINEAS Consulting\x0a15.10.2003\x0a\x0a\x0a\x0a\x0aDie Partnerfirmen der LINEAS Consulting\x0aGmbH\x0a\x0a\x0a \x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a 1: seite 2: \x0a 3: seite /^a/IF Capturing subpattern count = 0 Options: anchored No first char No need char /line\nbreak/I Capturing subpattern count = 0 Contains explicit CR or LF match No options First char = 'l' Need char = 'k' this is a line\nbreak 0: line\x0abreak line one\nthis is a line\nbreak in the second line 0: line\x0abreak /line\nbreak/If Capturing subpattern count = 0 Contains explicit CR or LF match Options: firstline First char = 'l' Need char = 'k' this is a line\nbreak 0: line\x0abreak ** Failers No match line one\nthis is a line\nbreak in the second line No match /line\nbreak/Imf Capturing subpattern count = 0 Contains explicit CR or LF match Options: multiline firstline First char = 'l' Need char = 'k' this is a line\nbreak 0: line\x0abreak ** Failers No match line one\nthis is a line\nbreak in the second line No match /ab.cd/IP ab-cd 0: ab-cd ab=cd 0: ab=cd ** Failers No match: POSIX code 17: match failed ab\ncd No match: POSIX code 17: match failed /ab.cd/IPs ab-cd 0: ab-cd ab=cd 0: ab=cd ab\ncd 0: ab\x0acd /(?i)(?-i)AbCd/I Capturing subpattern count = 0 No options First char = 'A' Need char = 'd' AbCd 0: AbCd ** Failers No match abcd No match /a{11111111111111111111}/I Failed: number too big in {} quantifier at offset 22 /(){64294967295}/I Failed: number too big in {} quantifier at offset 14 /(){2,4294967295}/I Failed: number too big in {} quantifier at offset 15 "(?i:a)(?i:b)(?i:c)(?i:d)(?i:e)(?i:f)(?i:g)(?i:h)(?i:i)(?i:j)(k)(?i:l)A\1B"I Capturing subpattern count = 1 Max back reference = 1 No options First char = 'a' (caseless) Need char = 'B' abcdefghijklAkB 0: abcdefghijklAkB 1: k "(?Pa)(?Pb)(?Pc)(?Pd)(?Pe)(?Pf)(?Pg)(?Ph)(?Pi)(?Pj)(?Pk)(?Pl)A\11B"I Capturing subpattern count = 12 Max back reference = 11 Named capturing subpatterns: n0 1 n1 2 n10 11 n11 12 n2 3 n3 4 n4 5 n5 6 n6 7 n7 8 n8 9 n9 10 No options First char = 'a' Need char = 'B' abcdefghijklAkB 0: abcdefghijklAkB 1: a 2: b 3: c 4: d 5: e 6: f 7: g 8: h 9: i 10: j 11: k 12: l "(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)A\11B"I Capturing subpattern count = 12 Max back reference = 11 No options First char = 'a' Need char = 'B' abcdefghijklAkB 0: abcdefghijklAkB 1: a 2: b 3: c 4: d 5: e 6: f 7: g 8: h 9: i 10: j 11: k 12: l "(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)(?Pa)"I Capturing subpattern count = 101 Named capturing subpatterns: name0 1 name1 2 name10 11 name100 101 name11 12 name12 13 name13 14 name14 15 name15 16 name16 17 name17 18 name18 19 name19 20 name2 3 name20 21 name21 22 name22 23 name23 24 name24 25 name25 26 name26 27 name27 28 name28 29 name29 30 name3 4 name30 31 name31 32 name32 33 name33 34 name34 35 name35 36 name36 37 name37 38 name38 39 name39 40 name4 5 name40 41 name41 42 name42 43 name43 44 name44 45 name45 46 name46 47 name47 48 name48 49 name49 50 name5 6 name50 51 name51 52 name52 53 name53 54 name54 55 name55 56 name56 57 name57 58 name58 59 name59 60 name6 7 name60 61 name61 62 name62 63 name63 64 name64 65 name65 66 name66 67 name67 68 name68 69 name69 70 name7 8 name70 71 name71 72 name72 73 name73 74 name74 75 name75 76 name76 77 name77 78 name78 79 name79 80 name8 9 name80 81 name81 82 name82 83 name83 84 name84 85 name85 86 name86 87 name87 88 name88 89 name89 90 name9 10 name90 91 name91 92 name92 93 name93 94 name94 95 name95 96 name96 97 name97 98 name98 99 name99 100 No options First char = 'a' Need char = 'a' aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa Matched, but too many substrings 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1: a 2: a 3: a 4: a 5: a 6: a 7: a 8: a 9: a 10: a 11: a 12: a 13: a 14: a "(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)(a)"I Capturing subpattern count = 101 No options First char = 'a' Need char = 'a' aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa Matched, but too many substrings 0: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 1: a 2: a 3: a 4: a 5: a 6: a 7: a 8: a 9: a 10: a 11: a 12: a 13: a 14: a /[^()]*(?:\((?R)\)[^()]*)*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char (this(and)that 0: (this(and)that) 0: (this(and)that) (this(and)that)stuff 0: (this(and)that)stuff /[^()]*(?:\((?>(?R))\)[^()]*)*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char (this(and)that 0: (this(and)that) 0: (this(and)that) /[^()]*(?:\((?R)\))*[^()]*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char (this(and)that 0: (this(and)that) 0: (this(and)that) /(?:\((?R)\))*[^()]*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char (this(and)that 0: (this(and)that) 0: ((this)) 0: ((this)) /(?:\((?R)\))|[^()]*/I Capturing subpattern count = 0 Partial matching not supported No options No first char No need char (this(and)that 0: (this(and)that) 0: (this) 0: (this) ((this)) 0: ((this)) /a(b)c/IPN abc Matched with REG_NOSUB /a(?Pb)c/IPN abc Matched with REG_NOSUB /\x{100}/I Failed: character value in \x{...} sequence is too large at offset 6 /\x{0000ff}/I Capturing subpattern count = 0 No options First char = 255 No need char /^((?Pa1)|(?Pa2)b)/I Failed: two named subpatterns have the same name at offset 17 /^((?Pa1)|(?Pa2)b)/IJ Capturing subpattern count = 3 Named capturing subpatterns: A 2 A 3 Options: anchored dupnames No first char No need char a1b\CA 0: a1 1: a1 2: a1 C a1 (2) A a2b\CA 0: a2b 1: a2b 2: 3: a2 C a2 (2) A ** Failers No match a1b\CZ\CA no parentheses with name "Z" 0: a1 1: a1 2: a1 copy substring Z failed -7 C a1 (2) A /^(?Pa)(?Pb)/IJ Capturing subpattern count = 2 Named capturing subpatterns: A 1 A 2 Options: anchored dupnames No first char No need char ab\CA 0: ab 1: a 2: b C a (1) A /^(?Pa)(?Pb)|cd/IJ Capturing subpattern count = 2 Named capturing subpatterns: A 1 A 2 Options: dupnames No first char No need char ab\CA 0: ab 1: a 2: b C a (1) A cd\CA 0: cd copy substring A failed -7 /^(?Pa)(?Pb)|cd(?Pef)(?Pgh)/IJ Capturing subpattern count = 4 Named capturing subpatterns: A 1 A 2 A 3 A 4 Options: dupnames No first char No need char cdefgh\CA 0: cdefgh 1: 2: 3: ef 4: gh C ef (2) A /^((?Pa1)|(?Pa2)b)/IJ Capturing subpattern count = 3 Named capturing subpatterns: A 2 A 3 Options: anchored dupnames No first char No need char a1b\GA 0: a1 1: a1 2: a1 G a1 (2) A a2b\GA 0: a2b 1: a2b 2: 3: a2 G a2 (2) A ** Failers No match a1b\GZ\GA no parentheses with name "Z" 0: a1 1: a1 2: a1 copy substring Z failed -7 G a1 (2) A /^(?Pa)(?Pb)/IJ Capturing subpattern count = 2 Named capturing subpatterns: A 1 A 2 Options: anchored dupnames No first char No need char ab\GA 0: ab 1: a 2: b G a (1) A /^(?Pa)(?Pb)|cd/IJ Capturing subpattern count = 2 Named capturing subpatterns: A 1 A 2 Options: dupnames No first char No need char ab\GA 0: ab 1: a 2: b G a (1) A cd\GA 0: cd copy substring A failed -7 /^(?Pa)(?Pb)|cd(?Pef)(?Pgh)/IJ Capturing subpattern count = 4 Named capturing subpatterns: A 1 A 2 A 3 A 4 Options: dupnames No first char No need char cdefgh\GA 0: cdefgh 1: 2: 3: ef 4: gh G ef (2) A /(?J)^((?Pa1)|(?Pa2)b)/I Capturing subpattern count = 3 Named capturing subpatterns: A 2 A 3 Options: anchored dupnames Duplicate name status changes No first char No need char a1b\CA 0: a1 1: a1 2: a1 C a1 (2) A a2b\CA 0: a2b 1: a2b 2: 3: a2 C a2 (2) A /^(?Pa) (?J:(?Pb)(?Pc)) (?Pd)/I Failed: two named subpatterns have the same name at offset 37 / In this next test, J is not set at the outer level; consequently it isn't set in the pattern's options; consequently pcre_get_named_substring() produces a random value. /Ix Capturing subpattern count = 1 Options: extended First char = 'I' Need char = 'e' /^(?Pa) (?J:(?Pb)(?Pc)) (?Pd)/I Capturing subpattern count = 4 Named capturing subpatterns: A 1 B 2 B 3 C 4 Options: anchored Duplicate name status changes No first char No need char a bc d\CA\CB\CC 0: a bc d 1: a 2: b 3: c 4: d C a (1) A C b (1) B C d (1) C /^(?Pa)?(?(A)a|b)/I Capturing subpattern count = 1 Named capturing subpatterns: A 1 Options: anchored No first char No need char aabc 0: aa 1: a bc 0: b ** Failers No match abc No match /(?:(?(ZZ)a|b)(?PX))+/I Capturing subpattern count = 1 Named capturing subpatterns: ZZ 1 No options No first char Need char = 'X' bXaX 0: bXaX 1: X /(?:(?(2y)a|b)(X))+/I Failed: reference to non-existent subpattern at offset 9 /(?:(?(ZA)a|b)(?PX))+/I Failed: reference to non-existent subpattern at offset 9 /(?:(?(ZZ)a|b)(?(ZZ)a|b)(?PX))+/I Capturing subpattern count = 1 Named capturing subpatterns: ZZ 1 No options No first char Need char = 'X' bbXaaX 0: bbXaaX 1: X /(?:(?(ZZ)a|\(b\))\\(?PX))+/I Capturing subpattern count = 1 Named capturing subpatterns: ZZ 1 No options No first char Need char = 'X' (b)\\Xa\\X 0: (b)\Xa\X 1: X /(?PX|Y))+/I Capturing subpattern count = 1 Max back reference = 1 Named capturing subpatterns: A 1 No options No first char No need char bXXaYYaY 0: bXXaYYaY 1: Y bXYaXXaX 0: bX 1: X /()()()()()()()()()(?:(?(A)(?P=A)a|b)(?PX|Y))+/I Capturing subpattern count = 10 Max back reference = 10 Named capturing subpatterns: A 10 No options No first char No need char bXXaYYaY 0: bXXaYYaY 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: Y /\777/I Failed: octal value is greater than \377 (not in UTF-8 mode) at offset 3 /\s*,\s*/IS Capturing subpattern count = 0 Partial matching not supported No options No first char Need char = ',' Starting byte set: \x09 \x0a \x0c \x0d \x20 , \x0b,\x0b 0: , \x0c,\x0d 0: \x0c,\x0d /^abc/Im Capturing subpattern count = 0 Options: multiline First char at start or follows newline Need char = 'c' xyz\nabc 0: abc xyz\nabc\ 0: abc xyz\r\nabc\ 0: abc xyz\rabc\ 0: abc xyz\r\nabc\ 0: abc ** Failers No match xyz\nabc\ No match xyz\r\nabc\ No match xyz\nabc\ No match xyz\rabc\ No match xyz\rabc\ No match /abc$/Im Capturing subpattern count = 0 Options: multiline Forced newline sequence: LF First char = 'a' Need char = 'c' xyzabc 0: abc xyzabc\n 0: abc xyzabc\npqr 0: abc xyzabc\r\ 0: abc xyzabc\rpqr\ 0: abc xyzabc\r\n\ 0: abc xyzabc\r\npqr\ 0: abc ** Failers No match xyzabc\r No match xyzabc\rpqr No match xyzabc\r\n No match xyzabc\r\npqr No match /^abc/Im Capturing subpattern count = 0 Options: multiline Forced newline sequence: CR First char at start or follows newline Need char = 'c' xyz\rabcdef 0: abc xyz\nabcdef\ 0: abc ** Failers No match xyz\nabcdef No match /^abc/Im Capturing subpattern count = 0 Options: multiline Forced newline sequence: LF First char at start or follows newline Need char = 'c' xyz\nabcdef 0: abc xyz\rabcdef\ 0: abc ** Failers No match xyz\rabcdef No match /^abc/Im Capturing subpattern count = 0 Options: multiline Forced newline sequence: CRLF First char at start or follows newline Need char = 'c' xyz\r\nabcdef 0: abc xyz\rabcdef\ 0: abc ** Failers No match xyz\rabcdef No match /^abc/Im Unknown newline type at: /abc/I Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' xyz\rabc\ Unknown newline type at: abc 0: abc /.*/I Capturing subpattern count = 0 Partial matching not supported Options: Forced newline sequence: LF First char at start or follows newline No need char abc\ndef 0: abc abc\rdef 0: abc\x0ddef abc\r\ndef 0: abc\x0d \abc\ndef 0: abc\x0adef \abc\rdef 0: abc \abc\r\ndef 0: abc \abc\ndef 0: abc\x0adef \abc\rdef 0: abc\x0ddef \abc\r\ndef 0: abc /\w+(.)(.)?def/Is Capturing subpattern count = 2 Partial matching not supported Options: dotall No first char Need char = 'f' abc\ndef 0: abc\x0adef 1: \x0a abc\rdef 0: abc\x0ddef 1: \x0d abc\r\ndef 0: abc\x0d\x0adef 1: \x0d 2: \x0a +((?:\s|//.*\\n|/[*](?:\\n|.)*?[*]/)*)+I Capturing subpattern count = 1 Partial matching not supported No options No first char No need char /* this is a C style comment */\M Minimum match() limit = 120 Minimum match() recursion limit = 6 0: /* this is a C style comment */ 1: /* this is a C style comment */ /(?P25[0-5]|2[0-4]\d|[01]?\d?\d)(?:\.(?P>B)){3}/I Capturing subpattern count = 1 Named capturing subpatterns: B 1 No options No first char Need char = '.' /()()()()()()()()()()()()()()()()()()()() ()()()()()()()()()()()()()()()()()()()() ()()()()()()()()()()()()()()()()()()()() ()()()()()()()()()()()()()()()()()()()() ()()()()()()()()()()()()()()()()()()()() (.(.))/Ix Capturing subpattern count = 102 Options: extended No first char No need char XY\O400 0: XY 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: 59: 60: 61: 62: 63: 64: 65: 66: 67: 68: 69: 70: 71: 72: 73: 74: 75: 76: 77: 78: 79: 80: 81: 82: 83: 84: 85: 86: 87: 88: 89: 90: 91: 92: 93: 94: 95: 96: 97: 98: 99: 100: 101: XY 102: Y /(a*b|(?i:c*(?-i)d))/IS Capturing subpattern count = 1 Partial matching not supported No options No first char No need char Starting byte set: C a b c d /()[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b /(|)[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b /(|c)[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b c /(|c?)[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b c /(d?|c?)[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b c d /(d?|c)[ab]xyz/IS Capturing subpattern count = 1 No options No first char Need char = 'z' Starting byte set: a b c d /^a*b\d/DZ ------------------------------------------------------------------ Bra ^ a*+ b \d Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored No first char Need char = 'b' /^a*+b\d/DZ ------------------------------------------------------------------ Bra ^ a*+ b \d Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored No first char Need char = 'b' /^a*?b\d/DZ ------------------------------------------------------------------ Bra ^ a*+ b \d Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored No first char Need char = 'b' /^a+A\d/DZ ------------------------------------------------------------------ Bra ^ a++ A \d Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored No first char Need char = 'A' aaaA5 0: aaaA5 ** Failers No match aaaa5 No match /^a*A\d/IiDZ ------------------------------------------------------------------ Bra ^ a* NC A \d Ket End ------------------------------------------------------------------ Capturing subpattern count = 0 Partial matching not supported Options: anchored caseless No first char Need char = 'A' (caseless) aaaA5 0: aaaA5 aaaa5 0: aaaa5 /(a*|b*)[cd]/IS Capturing subpattern count = 1 Partial matching not supported No options No first char No need char Starting byte set: a b c d /(a+|b*)[cd]/IS Capturing subpattern count = 1 Partial matching not supported No options No first char No need char Starting byte set: a b c d /(a*|b+)[cd]/IS Capturing subpattern count = 1 Partial matching not supported No options No first char No need char Starting byte set: a b c d /(a+|b+)[cd]/IS Capturing subpattern count = 1 Partial matching not supported No options No first char No need char Starting byte set: a b /(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((( (((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((( ((( a )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) )))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) ))) /Ix Capturing subpattern count = 203 Options: extended First char = 'a' No need char large nest Matched, but too many substrings 0: a 1: a 2: a 3: a 4: a 5: a 6: a 7: a 8: a 9: a 10: a 11: a 12: a 13: a 14: a /a*\d/BZ ------------------------------------------------------------------ Bra a*+ \d Ket End ------------------------------------------------------------------ /a*\D/BZ ------------------------------------------------------------------ Bra a* \D Ket End ------------------------------------------------------------------ /0*\d/BZ ------------------------------------------------------------------ Bra 0* \d Ket End ------------------------------------------------------------------ /0*\D/BZ ------------------------------------------------------------------ Bra 0*+ \D Ket End ------------------------------------------------------------------ /a*\s/BZ ------------------------------------------------------------------ Bra a*+ \s Ket End ------------------------------------------------------------------ /a*\S/BZ ------------------------------------------------------------------ Bra a* \S Ket End ------------------------------------------------------------------ / *\s/BZ ------------------------------------------------------------------ Bra * \s Ket End ------------------------------------------------------------------ / *\S/BZ ------------------------------------------------------------------ Bra *+ \S Ket End ------------------------------------------------------------------ /a*\w/BZ ------------------------------------------------------------------ Bra a* \w Ket End ------------------------------------------------------------------ /a*\W/BZ ------------------------------------------------------------------ Bra a*+ \W Ket End ------------------------------------------------------------------ /=*\w/BZ ------------------------------------------------------------------ Bra =*+ \w Ket End ------------------------------------------------------------------ /=*\W/BZ ------------------------------------------------------------------ Bra =* \W Ket End ------------------------------------------------------------------ /\d*a/BZ ------------------------------------------------------------------ Bra \d*+ a Ket End ------------------------------------------------------------------ /\d*2/BZ ------------------------------------------------------------------ Bra \d* 2 Ket End ------------------------------------------------------------------ /\d*\d/BZ ------------------------------------------------------------------ Bra \d* \d Ket End ------------------------------------------------------------------ /\d*\D/BZ ------------------------------------------------------------------ Bra \d*+ \D Ket End ------------------------------------------------------------------ /\d*\s/BZ ------------------------------------------------------------------ Bra \d*+ \s Ket End ------------------------------------------------------------------ /\d*\S/BZ ------------------------------------------------------------------ Bra \d* \S Ket End ------------------------------------------------------------------ /\d*\w/BZ ------------------------------------------------------------------ Bra \d* \w Ket End ------------------------------------------------------------------ /\d*\W/BZ ------------------------------------------------------------------ Bra \d*+ \W Ket End ------------------------------------------------------------------ /\D*a/BZ ------------------------------------------------------------------ Bra \D* a Ket End ------------------------------------------------------------------ /\D*2/BZ ------------------------------------------------------------------ Bra \D*+ 2 Ket End ------------------------------------------------------------------ /\D*\d/BZ ------------------------------------------------------------------ Bra \D*+ \d Ket End ------------------------------------------------------------------ /\D*\D/BZ ------------------------------------------------------------------ Bra \D* \D Ket End ------------------------------------------------------------------ /\D*\s/BZ ------------------------------------------------------------------ Bra \D* \s Ket End ------------------------------------------------------------------ /\D*\S/BZ ------------------------------------------------------------------ Bra \D* \S Ket End ------------------------------------------------------------------ /\D*\w/BZ ------------------------------------------------------------------ Bra \D* \w Ket End ------------------------------------------------------------------ /\D*\W/BZ ------------------------------------------------------------------ Bra \D* \W Ket End ------------------------------------------------------------------ /\s*a/BZ ------------------------------------------------------------------ Bra \s*+ a Ket End ------------------------------------------------------------------ /\s*2/BZ ------------------------------------------------------------------ Bra \s*+ 2 Ket End ------------------------------------------------------------------ /\s*\d/BZ ------------------------------------------------------------------ Bra \s*+ \d Ket End ------------------------------------------------------------------ /\s*\D/BZ ------------------------------------------------------------------ Bra \s* \D Ket End ------------------------------------------------------------------ /\s*\s/BZ ------------------------------------------------------------------ Bra \s* \s Ket End ------------------------------------------------------------------ /\s*\S/BZ ------------------------------------------------------------------ Bra \s*+ \S Ket End ------------------------------------------------------------------ /\s*\w/BZ ------------------------------------------------------------------ Bra \s*+ \w Ket End ------------------------------------------------------------------ /\s*\W/BZ ------------------------------------------------------------------ Bra \s* \W Ket End ------------------------------------------------------------------ /\S*a/BZ ------------------------------------------------------------------ Bra \S* a Ket End ------------------------------------------------------------------ /\S*2/BZ ------------------------------------------------------------------ Bra \S* 2 Ket End ------------------------------------------------------------------ /\S*\d/BZ ------------------------------------------------------------------ Bra \S* \d Ket End ------------------------------------------------------------------ /\S*\D/BZ ------------------------------------------------------------------ Bra \S* \D Ket End ------------------------------------------------------------------ /\S*\s/BZ ------------------------------------------------------------------ Bra \S*+ \s Ket End ------------------------------------------------------------------ /\S*\S/BZ ------------------------------------------------------------------ Bra \S* \S Ket End ------------------------------------------------------------------ /\S*\w/BZ ------------------------------------------------------------------ Bra \S* \w Ket End ------------------------------------------------------------------ /\S*\W/BZ ------------------------------------------------------------------ Bra \S* \W Ket End ------------------------------------------------------------------ /\w*a/BZ ------------------------------------------------------------------ Bra \w* a Ket End ------------------------------------------------------------------ /\w*2/BZ ------------------------------------------------------------------ Bra \w* 2 Ket End ------------------------------------------------------------------ /\w*\d/BZ ------------------------------------------------------------------ Bra \w* \d Ket End ------------------------------------------------------------------ /\w*\D/BZ ------------------------------------------------------------------ Bra \w* \D Ket End ------------------------------------------------------------------ /\w*\s/BZ ------------------------------------------------------------------ Bra \w*+ \s Ket End ------------------------------------------------------------------ /\w*\S/BZ ------------------------------------------------------------------ Bra \w* \S Ket End ------------------------------------------------------------------ /\w*\w/BZ ------------------------------------------------------------------ Bra \w* \w Ket End ------------------------------------------------------------------ /\w*\W/BZ ------------------------------------------------------------------ Bra \w*+ \W Ket End ------------------------------------------------------------------ /\W*a/BZ ------------------------------------------------------------------ Bra \W*+ a Ket End ------------------------------------------------------------------ /\W*2/BZ ------------------------------------------------------------------ Bra \W*+ 2 Ket End ------------------------------------------------------------------ /\W*\d/BZ ------------------------------------------------------------------ Bra \W*+ \d Ket End ------------------------------------------------------------------ /\W*\D/BZ ------------------------------------------------------------------ Bra \W* \D Ket End ------------------------------------------------------------------ /\W*\s/BZ ------------------------------------------------------------------ Bra \W* \s Ket End ------------------------------------------------------------------ /\W*\S/BZ ------------------------------------------------------------------ Bra \W* \S Ket End ------------------------------------------------------------------ /\W*\w/BZ ------------------------------------------------------------------ Bra \W*+ \w Ket End ------------------------------------------------------------------ /\W*\W/BZ ------------------------------------------------------------------ Bra \W* \W Ket End ------------------------------------------------------------------ /[^a]+a/BZ ------------------------------------------------------------------ Bra [^a]++ a Ket End ------------------------------------------------------------------ /[^a]+a/BZi ------------------------------------------------------------------ Bra [^A]++ NC a Ket End ------------------------------------------------------------------ /[^a]+A/BZi ------------------------------------------------------------------ Bra [^A]++ NC A Ket End ------------------------------------------------------------------ /[^a]+b/BZ ------------------------------------------------------------------ Bra [^a]+ b Ket End ------------------------------------------------------------------ /[^a]+\d/BZ ------------------------------------------------------------------ Bra [^a]+ \d Ket End ------------------------------------------------------------------ /a*[^a]/BZ ------------------------------------------------------------------ Bra a* [^a] Ket End ------------------------------------------------------------------ /(?Px)(?Py)/I Capturing subpattern count = 2 Named capturing subpatterns: abc 1 xyz 2 No options First char = 'x' Need char = 'y' xy\Cabc\Cxyz 0: xy 1: x 2: y C x (1) abc C y (1) xyz /(?x)(?'xyz'y)/I Capturing subpattern count = 2 Named capturing subpatterns: abc 1 xyz 2 No options First char = 'x' Need char = 'y' xy\Cabc\Cxyz 0: xy 1: x 2: y C x (1) abc C y (1) xyz /(?x)(?'xyz>y)/I Failed: syntax error in subpattern name (missing terminator) at offset 15 /(?P'abc'x)(?Py)/I Failed: unrecognized character after (?P at offset 3 /^(?:(?(ZZ)a|b)(?X))+/ bXaX 0: bXaX 1: X bXbX 0: bX 1: X ** Failers No match aXaX No match aXbX No match /^(?P>abc)(?xxx)/ Failed: reference to non-existent subpattern at offset 8 /^(?P>abc)(?x|y)/ xx 0: xx 1: x xy 0: xy 1: y yy 0: yy 1: y yx 0: yx 1: x /^(?P>abc)(?Px|y)/ xx 0: xx 1: x xy 0: xy 1: y yy 0: yy 1: y yx 0: yx 1: x /^((?(abc)a|b)(?x|y))+/ bxay 0: bxay 1: ay 2: y bxby 0: bx 1: bx 2: x ** Failers No match axby No match /^(((?P=abc)|X)(?x|y))+/ XxXxxx 0: XxXxxx 1: xx 2: x 3: x XxXyyx 0: XxXyyx 1: yx 2: y 3: x XxXyxx 0: XxXy 1: Xy 2: X 3: y ** Failers No match x No match /^(?1)(abc)/ abcabc 0: abcabc 1: abc /^(?:(?:\1|X)(a|b))+/ Xaaa 0: Xaaa 1: a Xaba 0: Xa 1: a /^[\E\Qa\E-\Qz\E]+/BZ ------------------------------------------------------------------ Bra ^ [a-z]+ Ket End ------------------------------------------------------------------ /^[a\Q]bc\E]/BZ ------------------------------------------------------------------ Bra ^ [\]a-c] Ket End ------------------------------------------------------------------ /^[a-\Q\E]/BZ ------------------------------------------------------------------ Bra ^ [\-a] Ket End ------------------------------------------------------------------ /^(?P>abc)[()](?)/BZ ------------------------------------------------------------------ Bra ^ Once Recurse Ket [()] CBra 1 Ket Ket End ------------------------------------------------------------------ /^((?(abc)y)[()](?Px))+/BZ ------------------------------------------------------------------ Bra ^ CBra 1 Cond 2 Cond ref y Ket [()] CBra 2 x Ket KetRmax Ket End ------------------------------------------------------------------ (xy)x 0: (xy)x 1: y)x 2: x /^(?P>abc)\Q()\E(?)/BZ ------------------------------------------------------------------ Bra ^ Once Recurse Ket () CBra 1 Ket Ket End ------------------------------------------------------------------ /^(?P>abc)[a\Q(]\E(](?)/BZ ------------------------------------------------------------------ Bra ^ Once Recurse Ket [(\]a] CBra 1 Ket Ket End ------------------------------------------------------------------ /^(?P>abc) # this is (a comment) (?)/BZx ------------------------------------------------------------------ Bra ^ Once Recurse Ket CBra 1 Ket Ket End ------------------------------------------------------------------ /^\W*(?:(?(?.)\W*(?&one)\W*\k|)|(?(?.)\W*(?&three)\W*\k'four'|\W*.\W*))\W*$/Ii Capturing subpattern count = 4 Max back reference = 4 Named capturing subpatterns: four 4 one 1 three 3 two 2 Partial matching not supported Options: anchored caseless No first char No need char 1221 0: 1221 1: 1221 2: 1 Satan, oscillate my metallic sonatas! 0: Satan, oscillate my metallic sonatas! 1: 2: 3: Satan, oscillate my metallic sonatas 4: S A man, a plan, a canal: Panama! 0: A man, a plan, a canal: Panama! 1: 2: 3: A man, a plan, a canal: Panama 4: A Able was I ere I saw Elba. 0: Able was I ere I saw Elba. 1: 2: 3: Able was I ere I saw Elba 4: A *** Failers No match The quick brown fox No match /(?=(\w+))\1:/I Capturing subpattern count = 1 Max back reference = 1 Partial matching not supported No options No first char Need char = ':' abcd: 0: abcd: 1: abcd /(?=(?'abc'\w+))\k:/I Capturing subpattern count = 1 Max back reference = 1 Named capturing subpatterns: abc 1 Partial matching not supported No options No first char Need char = ':' abcd: 0: abcd: 1: abcd /(?'abc'\w+):\k{2}/ a:aaxyz 0: a:aa 1: a ab:ababxyz 0: ab:abab 1: ab ** Failers No match a:axyz No match ab:abxyz No match /(?'abc'a|b)(?d|e)\k{2}/J adaa 0: adaa 1: a 2: d ** Failers No match addd No match adbb No match /(?'abc'a|b)(?d|e)(?&abc){2}/J bdaa 0: bdaa 1: b 2: d bdab 0: bdab 1: b 2: d ** Failers No match bddd No match /^(?a)? (?()b|c) (?('ab')d|e)/x abd 0: abd 1: a ce 0: ce /(?( (?'B' abc (?(R) (?(R&A)1) (?(R&B)2) X | (?1) (?2) (?R) ))) /x abcabc1Xabc2XabcXabcabc 0: abcabc1Xabc2XabcX 1: abcabc1Xabc2XabcX 2: abcabc1Xabc2XabcX /(? (?'B' abc (?(R) (?(R&1)1) (?(R&B)2) X | (?1) (?2) (?R) ))) /x Failed: reference to non-existent subpattern at offset 29 /(?<1> (?'B' abc (?(R) (?(R&1)1) (?(R&B)2) X | (?1) (?2) (?R) ))) /x abcabc1Xabc2XabcXabcabc 0: abcabc1Xabc2XabcX 1: abcabc1Xabc2XabcX 2: abcabc1Xabc2XabcX /^(?(DEFINE) (? a) (? b) ) (?&A) (?&B) /x abcd 0: ab 1: 2: /(?(?&NAME_PAT))\s+(?(?&ADDRESS_PAT)) (?(DEFINE) (?[a-z]+) (?\d+) )/x metcalfe 33 0: metcalfe 33 1: metcalfe 2: 33 3: 4: /^(?(DEFINE) abc | xyz ) /x Failed: DEFINE group contains more than one branch at offset 22 /(?(DEFINE) abc) xyz/xI Capturing subpattern count = 0 Options: extended First char = 'x' Need char = 'z' /(?(DEFINE) abc){3} xyz/x Failed: repeating a DEFINE group is not allowed at offset 17 /(a|)*\d/ \O0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa No match \O0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa4 Matched, but too many substrings /^a.b/ a\rb 0: a\x0db a\nb\ 0: a\x0ab a\x85b\ 0: a\x85b ** Failers No match a\nb No match a\nb\ No match a\rb\ No match a\rb\ No match a\x85b\ No match a\rb\ No match /^abc./mgx abc1 \x0aabc2 \x0babc3xx \x0cabc4 \x0dabc5xx \x0d\x0aabc6 \x85abc7 \x{2028}abc8 \x{2029}abc9 JUNK 0: abc1 0: abc2 0: abc3 0: abc4 0: abc5 0: abc6 0: abc7 /abc.$/mgx abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc7\x{2028} abc8\x{2029} abc9 0: abc1 0: abc2 0: abc3 0: abc4 0: abc5 0: abc6 0: abc9 /a/ /a/ Failed: inconsistent NEWLINE options at offset 0 /^a\Rb/ a\nb 0: a\x0ab a\rb 0: a\x0db a\r\nb 0: a\x0d\x0ab a\x0bb 0: a\x0bb a\x0cb 0: a\x0cb a\x85b 0: a\x85b ** Failers No match a\n\rb No match /^a\R*b/ ab 0: ab a\nb 0: a\x0ab a\rb 0: a\x0db a\r\nb 0: a\x0d\x0ab a\x0bb 0: a\x0bb a\x0cb 0: a\x0cb a\x85b 0: a\x85b a\n\rb 0: a\x0a\x0db a\n\r\x85\x0cb 0: a\x0a\x0d\x85\x0cb /^a\R+b/ a\nb 0: a\x0ab a\rb 0: a\x0db a\r\nb 0: a\x0d\x0ab a\x0bb 0: a\x0bb a\x0cb 0: a\x0cb a\x85b 0: a\x85b a\n\rb 0: a\x0a\x0db a\n\r\x85\x0cb 0: a\x0a\x0d\x85\x0cb ** Failers No match ab No match /^a\R{1,3}b/ a\nb 0: a\x0ab a\n\rb 0: a\x0a\x0db a\n\r\x85b 0: a\x0a\x0d\x85b a\r\n\r\nb 0: a\x0d\x0a\x0d\x0ab a\r\n\r\n\r\nb 0: a\x0d\x0a\x0d\x0a\x0d\x0ab a\n\r\n\rb 0: a\x0a\x0d\x0a\x0db a\n\n\r\nb 0: a\x0a\x0a\x0d\x0ab ** Failers No match a\n\n\n\rb No match a\r No match /^a[\R]b/ aRb 0: aRb ** Failers No match a\nb No match /(?&abc)X(?P)/I Capturing subpattern count = 1 Named capturing subpatterns: abc 1 No options No first char Need char = 'P' abcPXP123 0: PXP 1: P /(?1)X(?P)/I Capturing subpattern count = 1 Named capturing subpatterns: abc 1 No options No first char Need char = 'P' abcPXP123 0: PXP 1: P /(?(DEFINE)(?2[0-4]\d|25[0-5]|1\d\d|[1-9]?\d))\b(?&byte)(\.(?&byte)){3}/ 1.2.3.4 0: 1.2.3.4 1: 2: .4 131.111.10.206 0: 131.111.10.206 1: 2: .206 10.0.0.0 0: 10.0.0.0 1: 2: .0 ** Failers No match 10.6 No match 455.3.4.5 No match /\b(?&byte)(\.(?&byte)){3}(?(DEFINE)(?2[0-4]\d|25[0-5]|1\d\d|[1-9]?\d))/ 1.2.3.4 0: 1.2.3.4 1: .4 2: 131.111.10.206 0: 131.111.10.206 1: .206 2: 10.0.0.0 0: 10.0.0.0 1: .0 2: ** Failers No match 10.6 No match 455.3.4.5 No match /(?:a(?&abc)b)*(?x)/ 123axbaxbaxbx456 0: axbaxbaxbx 1: x 123axbaxbaxb456 0: x 1: x /(?:a(?&abc)b){1,5}(?x)/ 123axbaxbaxbx456 0: axbaxbaxbx 1: x /(?:a(?&abc)b){2,5}(?x)/ 123axbaxbaxbx456 0: axbaxbaxbx 1: x /(?:a(?&abc)b){2,}(?x)/ 123axbaxbaxbx456 0: axbaxbaxbx 1: x /(abc)(?i:(?1))/ defabcabcxyz 0: abcabc 1: abc DEFabcABCXYZ No match /(abc)(?:(?i)(?1))/ defabcabcxyz 0: abcabc 1: abc DEFabcABCXYZ No match /^(a(b))\1\g1\g{1}\g-1\g{-1}\g{-02}Z/ ababababbbabZXXXX 0: ababababbbabZ 1: ab 2: b /^(a)\g-2/ Failed: reference to non-existent subpattern at offset 7 /^(a)\g/ Failed: \g is not followed by a braced name or an optionally braced non-zero number at offset 5 /^(a)\g{0}/ Failed: \g is not followed by a braced name or an optionally braced non-zero number at offset 7 /^(a)\g{3/ Failed: \g is not followed by a braced name or an optionally braced non-zero number at offset 8 /^(a)\g{4a}/ Failed: reference to non-existent subpattern at offset 9 /^a.b/ a\rb 0: a\x0db *** Failers No match a\nb No match /.+foo/ afoo 0: afoo ** Failers No match \r\nfoo No match \nfoo No match /.+foo/ afoo 0: afoo \nfoo 0: \x0afoo ** Failers No match \r\nfoo No match /.+foo/ afoo 0: afoo ** Failers No match \nfoo No match \r\nfoo No match /.+foo/s afoo 0: afoo \r\nfoo 0: \x0d\x0afoo \nfoo 0: \x0afoo /^$/mg abc\r\rxyz 0: abc\n\rxyz 0: ** Failers No match abc\r\nxyz No match /(?m)^$/g+ abc\r\n\r\n 0: 0+ \x0d\x0a /(?m)^$|^\r\n/g+ abc\r\n\r\n 0: 0+ \x0d\x0a 0: \x0d\x0a 0+ /(?m)$/g+ abc\r\n\r\n 0: 0+ \x0d\x0a\x0d\x0a 0: 0+ \x0d\x0a 0: 0+ /abc.$/mgx abc1\x0a abc2\x0b abc3\x0c abc4\x0d abc5\x0d\x0a abc6\x85 abc7\x{2028} abc8\x{2029} abc9 0: abc1 0: abc4 0: abc5 0: abc9 /^X/m XABC 0: X ** Failers No match XABC\B No match /(ab|c)(?-1)/BZ ------------------------------------------------------------------ Bra CBra 1 ab Alt c Ket Once Recurse Ket Ket End ------------------------------------------------------------------ abc 0: abc 1: ab /xy(?+1)(abc)/BZ ------------------------------------------------------------------ Bra xy Once Recurse Ket CBra 1 abc Ket Ket End ------------------------------------------------------------------ xyabcabc 0: xyabcabc 1: abc ** Failers No match xyabc No match /x(?-0)y/ Failed: (?+ or (?- or (?(+ or (?(- must be followed by a non-zero number at offset 5 /x(?-1)y/ Failed: reference to non-existent subpattern at offset 5 /x(?+0)y/ Failed: (?+ or (?- or (?(+ or (?(- must be followed by a non-zero number at offset 5 /x(?+1)y/ Failed: reference to non-existent subpattern at offset 5 /^(abc)?(?(-1)X|Y)/BZ ------------------------------------------------------------------ Bra ^ Brazero CBra 1 abc Ket Cond 1 Cond ref X Alt Y Ket Ket End ------------------------------------------------------------------ abcX 0: abcX 1: abc Y 0: Y ** Failers No match abcY No match /^((?(+1)X|Y)(abc))+/BZ ------------------------------------------------------------------ Bra ^ CBra 1 Cond 2 Cond ref X Alt Y Ket CBra 2 abc Ket KetRmax Ket End ------------------------------------------------------------------ YabcXabc 0: YabcXabc 1: Xabc 2: abc YabcXabcXabc 0: YabcXabcXabc 1: Xabc 2: abc ** Failers No match XabcXabc No match /(?(-1)a)/BZ Failed: reference to non-existent subpattern at offset 6 /((?(-1)a))/BZ ------------------------------------------------------------------ Bra CBra 1 Cond 1 Cond ref a Ket Ket Ket End ------------------------------------------------------------------ /((?(-2)a))/BZ Failed: reference to non-existent subpattern at offset 7 /^(?(+1)X|Y)(.)/BZ ------------------------------------------------------------------ Bra ^ Cond 1 Cond ref X Alt Y Ket CBra 1 Any Ket Ket End ------------------------------------------------------------------ Y! 0: Y! 1: ! /(foo)\Kbar/ foobar 0: bar 1: foo /(foo)(\Kbar|baz)/ foobar 0: bar 1: foo 2: bar foobaz 0: foobaz 1: foo 2: baz /(foo\Kbar)baz/ foobarbaz 0: barbaz 1: foobar /(?tom|bon)-\k{A}/ tom-tom 0: tom-tom 1: tom bon-bon 0: bon-bon 1: bon ** Failers No match tom-bon No match /(?tom|bon)-\g{A}/ tom-tom 0: tom-tom 1: tom bon-bon 0: bon-bon 1: bon /\g{A/ Failed: syntax error in subpattern name (missing terminator) at offset 4 /(?|(abc)|(xyz))/BZ ------------------------------------------------------------------ Bra Bra CBra 1 abc Ket Alt CBra 1 xyz Ket Ket Ket End ------------------------------------------------------------------ >abc< 0: abc 1: abc >xyz< 0: xyz 1: xyz /(x)(?|(abc)|(xyz))(x)/BZ ------------------------------------------------------------------ Bra CBra 1 x Ket Bra CBra 2 abc Ket Alt CBra 2 xyz Ket Ket CBra 3 x Ket Ket End ------------------------------------------------------------------ xabcx 0: xabcx 1: x 2: abc 3: x xxyzx 0: xxyzx 1: x 2: xyz 3: x /(x)(?|(abc)(pqr)|(xyz))(x)/BZ ------------------------------------------------------------------ Bra CBra 1 x Ket Bra CBra 2 abc Ket CBra 3 pqr Ket Alt CBra 2 xyz Ket Ket CBra 4 x Ket Ket End ------------------------------------------------------------------ xabcpqrx 0: xabcpqrx 1: x 2: abc 3: pqr 4: x xxyzx 0: xxyzx 1: x 2: xyz 3: 4: x /(?|(abc)|(xyz))\1/ abcabc 0: abcabc 1: abc xyzxyz 0: xyzxyz 1: xyz ** Failers No match abcxyz No match xyzabc No match /(?|(abc)|(xyz))(?1)/ abcabc 0: abcabc 1: abc xyzabc 0: xyzabc 1: xyz ** Failers No match xyzxyz No match /\H\h\V\v/ X X\x0a 0: X X\x0a X\x09X\x0b 0: X\x09X\x0b ** Failers No match \xa0 X\x0a No match /\H*\h+\V?\v{3,4}/ \x09\x20\xa0X\x0a\x0b\x0c\x0d\x0a 0: \x09 \xa0X\x0a\x0b\x0c\x0d \x09\x20\xa0\x0a\x0b\x0c\x0d\x0a 0: \x09 \xa0\x0a\x0b\x0c\x0d \x09\x20\xa0\x0a\x0b\x0c 0: \x09 \xa0\x0a\x0b\x0c ** Failers No match \x09\x20\xa0\x0a\x0b No match /\H{3,4}/ XY ABCDE 0: ABCD XY PQR ST 0: PQR /.\h{3,4}./ XY AB PQRS 0: B P /\h*X\h?\H+Y\H?Z/ >XNNNYZ 0: XNNNYZ > X NYQZ 0: X NYQZ ** Failers No match >XYZ No match > X NY Z No match /\v*X\v?Y\v+Z\V*\x0a\V+\x0b\V{2,3}\x0c/ >XY\x0aZ\x0aA\x0bNN\x0c 0: XY\x0aZ\x0aA\x0bNN\x0c >\x0a\x0dX\x0aY\x0a\x0bZZZ\x0aAAA\x0bNNN\x0c 0: \x0a\x0dX\x0aY\x0a\x0bZZZ\x0aAAA\x0bNNN\x0c /[\h]/BZ ------------------------------------------------------------------ Bra [\x09 \xa0] Ket End ------------------------------------------------------------------ >\x09< 0: \x09 /[\h]+/BZ ------------------------------------------------------------------ Bra [\x09 \xa0]+ Ket End ------------------------------------------------------------------ >\x09\x20\xa0< 0: \x09 \xa0 /[\v]/BZ ------------------------------------------------------------------ Bra [\x0a-\x0d\x85] Ket End ------------------------------------------------------------------ /[\H]/BZ ------------------------------------------------------------------ Bra [\x00-\x08\x0a-\x1f!-\x9f\xa1-\xff] Ket End ------------------------------------------------------------------ /[^\h]/BZ ------------------------------------------------------------------ Bra [\x00-\x08\x0a-\x1f!-\x9f\xa1-\xff] (neg) Ket End ------------------------------------------------------------------ /[\V]/BZ ------------------------------------------------------------------ Bra [\x00-\x09\x0e-\x84\x86-\xff] Ket End ------------------------------------------------------------------ /[\x0a\V]/BZ ------------------------------------------------------------------ Bra [\x00-\x0a\x0e-\x84\x86-\xff] Ket End ------------------------------------------------------------------ /\H++X/BZ ------------------------------------------------------------------ Bra \H++ X Ket End ------------------------------------------------------------------ ** Failers No match XXXX No match /\H+\hY/BZ ------------------------------------------------------------------ Bra \H++ \h Y Ket End ------------------------------------------------------------------ XXXX Y 0: XXXX Y /\H+ Y/BZ ------------------------------------------------------------------ Bra \H++ Y Ket End ------------------------------------------------------------------ /\h+A/BZ ------------------------------------------------------------------ Bra \h++ A Ket End ------------------------------------------------------------------ /\v*B/BZ ------------------------------------------------------------------ Bra \v*+ B Ket End ------------------------------------------------------------------ /\V+\x0a/BZ ------------------------------------------------------------------ Bra \V++ \x0a Ket End ------------------------------------------------------------------ /A+\h/BZ ------------------------------------------------------------------ Bra A++ \h Ket End ------------------------------------------------------------------ / *\H/BZ ------------------------------------------------------------------ Bra *+ \H Ket End ------------------------------------------------------------------ /A*\v/BZ ------------------------------------------------------------------ Bra A*+ \v Ket End ------------------------------------------------------------------ /\x0b*\V/BZ ------------------------------------------------------------------ Bra \x0b*+ \V Ket End ------------------------------------------------------------------ /\d+\h/BZ ------------------------------------------------------------------ Bra \d++ \h Ket End ------------------------------------------------------------------ /\d*\v/BZ ------------------------------------------------------------------ Bra \d*+ \v Ket End ------------------------------------------------------------------ /S+\h\S+\v/BZ ------------------------------------------------------------------ Bra S++ \h \S++ \v Ket End ------------------------------------------------------------------ /\w{3,}\h\w+\v/BZ ------------------------------------------------------------------ Bra \w{3} \w*+ \h \w++ \v Ket End ------------------------------------------------------------------ /\h+\d\h+\w\h+\S\h+\H/BZ ------------------------------------------------------------------ Bra \h++ \d \h++ \w \h++ \S \h++ \H Ket End ------------------------------------------------------------------ /\v+\d\v+\w\v+\S\v+\V/BZ ------------------------------------------------------------------ Bra \v++ \d \v++ \w \v+ \S \v++ \V Ket End ------------------------------------------------------------------ /\H+\h\H+\d/BZ ------------------------------------------------------------------ Bra \H++ \h \H+ \d Ket End ------------------------------------------------------------------ /\V+\v\V+\w/BZ ------------------------------------------------------------------ Bra \V++ \v \V+ \w Ket End ------------------------------------------------------------------ /\( (?: [^()]* | (?R) )* \)/x 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/[\E]AAA/ Failed: missing terminating ] for character class at offset 7 /[\Q\E]AAA/ Failed: missing terminating ] for character class at offset 9 /[^\E]AAA/ Failed: missing terminating ] for character class at offset 8 /[^\Q\E]AAA/ Failed: missing terminating ] for character class at offset 10 /[\E^]AAA/ Failed: missing terminating ] for character class at offset 8 /[\Q\E^]AAA/ Failed: missing terminating ] for character class at offset 10 /A(*PRUNE)B(*SKIP)C(*THEN)D(*COMMIT)E(*F)F(*FAIL)G(?!)H(*ACCEPT)I/BZ ------------------------------------------------------------------ Bra A *PRUNE B *SKIP C *THEN D *COMMIT E *FAIL F *FAIL G *FAIL H *ACCEPT I Ket End ------------------------------------------------------------------ /^a+(*FAIL)/ aaaaaa No match /a+b?c+(*FAIL)/ aaabccc No match /a+b?(*PRUNE)c+(*FAIL)/ aaabccc No match /a+b?(*COMMIT)c+(*FAIL)/ aaabccc No match /a+b?(*SKIP)c+(*FAIL)/ aaabcccaaabccc No match /^(?:aaa(*THEN)\w{6}|bbb(*THEN)\w{5}|ccc(*THEN)\w{4}|\w{3})/ aaaxxxxxx 0: aaaxxxxxx aaa++++++ 0: aaa bbbxxxxx 0: bbbxxxxx bbb+++++ 0: bbb cccxxxx 0: cccxxxx ccc++++ 0: ccc dddddddd 0: ddd /^(aaa(*THEN)\w{6}|bbb(*THEN)\w{5}|ccc(*THEN)\w{4}|\w{3})/ aaaxxxxxx 0: aaaxxxxxx 1: aaaxxxxxx aaa++++++ 0: aaa 1: aaa bbbxxxxx 0: bbbxxxxx 1: bbbxxxxx bbb+++++ 0: bbb 1: bbb cccxxxx 0: cccxxxx 1: cccxxxx ccc++++ 0: ccc 1: ccc dddddddd 0: ddd 1: ddd /a+b?(*THEN)c+(*FAIL)/ aaabccc No match /(A (A|B(*ACCEPT)|C) D)(E)/x ABX 0: AB AADE 0: AADE 1: AAD 2: A 3: E ACDE 0: ACDE 1: ACD 2: C 3: E ** Failers No match AD No match /^a+(*FAIL)/C aaaaaa --->aaaaaa +0 ^ ^ +1 ^ a+ +3 ^ ^ (*FAIL) +3 ^ ^ (*FAIL) +3 ^ ^ (*FAIL) +3 ^ ^ (*FAIL) +3 ^ ^ (*FAIL) +3 ^^ (*FAIL) No match /a+b?c+(*FAIL)/C aaabccc --->aaabccc +0 ^ a+ +2 ^ ^ b? +4 ^ ^ c+ +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +4 ^ ^ c+ +2 ^ ^ b? +4 ^ ^ c+ +2 ^^ b? +4 ^^ c+ +0 ^ a+ +2 ^ ^ b? +4 ^ ^ c+ +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +4 ^ ^ c+ +2 ^^ b? +4 ^^ c+ +0 ^ a+ +2 ^^ b? +4 ^ ^ c+ +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +6 ^ ^ (*FAIL) +4 ^^ c+ No match /a+b?(*PRUNE)c+(*FAIL)/C aaabccc --->aaabccc +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*PRUNE) +12 ^ ^ c+ +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*PRUNE) +12 ^ ^ c+ +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) +0 ^ a+ +2 ^^ b? +4 ^ ^ (*PRUNE) +12 ^ ^ c+ +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) +14 ^ ^ (*FAIL) No match /a+b?(*COMMIT)c+(*FAIL)/C aaabccc --->aaabccc +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*COMMIT) +13 ^ ^ c+ +15 ^ ^ (*FAIL) +15 ^ ^ (*FAIL) +15 ^ ^ (*FAIL) No match /a+b?(*SKIP)c+(*FAIL)/C aaabcccaaabccc --->aaabcccaaabccc +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*SKIP) +11 ^ ^ c+ +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*SKIP) +11 ^ ^ c+ +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) No match /a+b?(*THEN)c+(*FAIL)/C aaabccc --->aaabccc +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*THEN) +11 ^ ^ c+ +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +0 ^ a+ +2 ^ ^ b? +4 ^ ^ (*THEN) +11 ^ ^ c+ +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +0 ^ a+ +2 ^^ b? +4 ^ ^ (*THEN) +11 ^ ^ c+ +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) +13 ^ ^ (*FAIL) No match /a(*PRUNE:XXX)b/ Failed: (*VERB) with an argument is not supported at offset 8 /a(*MARK)b/ Failed: (*VERB) not recognized at offset 7 /(?i:A{1,}\6666666666)/ Failed: number is too big at offset 19 /\g6666666666/ Failed: number is too big at offset 11 /[\g6666666666]/ Failed: number is too big at offset 12 /(?1)\c[/ Failed: reference to non-existent subpattern at offset 3 /.+A/ \r\nA No match /\nA/ \r\nA 0: \x0aA /[\r\n]A/ \r\nA 0: \x0aA /(\r|\n)A/ \r\nA 0: \x0aA 1: \x0a /a(*CR)b/ Failed: (*VERB) not recognized at offset 5 /(*CR)a.b/ a\nb 0: a\x0ab ** Failers No match a\rb No match /(*CR)a.b/ a\nb 0: a\x0ab ** Failers No match a\rb No match /(*LF)a.b/ a\rb 0: a\x0db ** Failers No match a\nb No match /(*CRLF)a.b/ a\rb 0: a\x0db a\nb 0: a\x0ab ** Failers No match a\r\nb No match /(*ANYCRLF)a.b/ ** Failers No match a\rb No match a\nb No match a\r\nb No match /(*ANY)a.b/ ** Failers No match a\rb No match a\nb No match a\r\nb No match a\x85b No match /a\Rb/I Capturing subpattern count = 0 Options: bsr_anycrlf First char = 'a' Need char = 'b' a\rb 0: a\x0db a\nb 0: a\x0ab a\r\nb 0: a\x0d\x0ab ** Failers No match a\x85b No match a\x0bb No match /a\Rb/I Capturing subpattern count = 0 Options: bsr_unicode First char = 'a' Need char = 'b' a\rb 0: a\x0db a\nb 0: a\x0ab a\r\nb 0: a\x0d\x0ab a\x85b 0: a\x85b a\x0bb 0: a\x0bb ** Failers No match a\x85b\ No match a\x0bb\ No match /a\R?b/I Capturing subpattern count = 0 Options: bsr_anycrlf First char = 'a' Need char = 'b' a\rb 0: a\x0db a\nb 0: a\x0ab a\r\nb 0: a\x0d\x0ab ** Failers No match a\x85b No match a\x0bb No match /a\R?b/I Capturing subpattern count = 0 Options: bsr_unicode First char = 'a' Need char = 'b' a\rb 0: a\x0db a\nb 0: a\x0ab a\r\nb 0: a\x0d\x0ab a\x85b 0: a\x85b a\x0bb 0: a\x0bb ** Failers No match a\x85b\ No match a\x0bb\ No match /a\R{2,4}b/I Capturing subpattern count = 0 Partial matching not supported Options: bsr_anycrlf First char = 'a' Need char = 'b' a\r\n\nb 0: a\x0d\x0a\x0ab a\n\r\rb 0: a\x0a\x0d\x0db a\r\n\r\n\r\n\r\nb 0: a\x0d\x0a\x0d\x0a\x0d\x0a\x0d\x0ab ** Failers No match a\x85\85b No match a\x0b\0bb No match /a\R{2,4}b/I Capturing subpattern count = 0 Partial matching not supported Options: bsr_unicode First char = 'a' Need char = 'b' a\r\rb 0: a\x0d\x0db a\n\n\nb 0: a\x0a\x0a\x0ab a\r\n\n\r\rb 0: a\x0d\x0a\x0a\x0d\x0db a\x85\85b No match a\x0b\0bb No match ** Failers No match a\r\r\r\r\rb No match a\x85\85b\ No match a\x0b\0bb\ No match /(*BSR_ANYCRLF)a\Rb/I Capturing subpattern count = 0 Options: bsr_anycrlf First char = 'a' Need char = 'b' a\nb 0: a\x0ab a\rb 0: a\x0db /(*BSR_UNICODE)a\Rb/I Capturing subpattern count = 0 Options: bsr_unicode First char = 'a' Need char = 'b' a\x85b 0: a\x85b /(*BSR_ANYCRLF)(*CRLF)a\Rb/I Capturing subpattern count = 0 Options: bsr_anycrlf Forced newline sequence: CRLF First char = 'a' Need char = 'b' a\nb 0: a\x0ab a\rb 0: a\x0db /(*CRLF)(*BSR_UNICODE)a\Rb/I Capturing subpattern count = 0 Options: bsr_unicode Forced newline sequence: CRLF First char = 'a' Need char = 'b' a\x85b 0: a\x85b /(*CRLF)(*BSR_ANYCRLF)(*CR)ab/I Capturing subpattern count = 0 Options: bsr_anycrlf Forced newline sequence: CR First char = 'a' Need char = 'b' /(?)(?&)/ Failed: subpattern name expected at offset 9 /(?)(?&a)/ Failed: reference to non-existent subpattern at offset 12 /(?)(?&aaaaaaaaaaaaaaaaaaaaaaa)/ Failed: reference to non-existent subpattern at offset 32 /(?+-a)/ Failed: digit expected after (?+ at offset 3 /(?-+a)/ Failed: unrecognized character after (? or (?- at offset 3 /(?(-1))/ Failed: reference to non-existent subpattern at offset 6 /(?(+10))/ Failed: reference to non-existent subpattern at offset 7 /(?(10))/ Failed: reference to non-existent subpattern at offset 6 /(?(+2))()()/ /(?(2))()()/ /\k''/ Failed: subpattern name expected at offset 3 /\k<>/ Failed: subpattern name expected at offset 3 /\k{}/ Failed: subpattern name expected at offset 3 /(?P=)/ Failed: subpattern name expected at offset 4 /(?P>)/ Failed: subpattern name expected at offset 4 /(?!\w)(?R)/ Failed: recursive call could loop indefinitely at offset 9 /(?=\w)(?R)/ Failed: recursive call could loop indefinitely at offset 9 /(?