PCRE version 3.9 02-Jan-2002 /(a)b|/ Capturing subpattern count = 1 No options No first char No need char /abc/ 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/ Capturing subpattern count = 0 Options: anchored No first char Need char = 'c' abc 0: abc \Aabc 0: abc *** Failers No match defabc No match \Adefabc No match /a+bc/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /a*bc/ Capturing subpattern count = 0 No options No first char Need char = 'c' /a{3}bc/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /(abc|a+z)/ Capturing subpattern count = 1 No options First char = 'a' No need char /^abc$/ Capturing subpattern count = 0 Options: anchored No first char Need char = 'c' abc 0: abc *** Failers No match def\nabc No match /ab\gdef/X Failed: unrecognized character follows \ at offset 3 /(?X)ab\gdef/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 /[\B]/ Failed: invalid escape sequence in character class at offset 2 /[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 (? at offset 2 /.*b/ Capturing subpattern count = 0 No options First char at start or follows \n Need char = 'b' /.*?b/ Capturing subpattern count = 0 No options First char at start or follows \n Need char = 'b' /cat|dog|elephant/ 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/S Capturing subpattern count = 0 No options No first char No need char Starting character 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/iS Capturing subpattern count = 0 Options: caseless No first char No need char Starting character 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]/S Capturing subpattern count = 0 No options No first char No need char Starting character set: a b c d /(a|[^\dZ])/S Capturing subpattern count = 1 No options No first char No need char Starting character 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]/S Capturing subpattern count = 1 No options No first char No need char Starting character set: \x09 \x0a \x0b \x0c \x0d \x20 a b /(ab\2)/ Failed: back reference to non-existent subpattern at offset 6 /{4,5}abc/ Failed: nothing to repeat at offset 4 /(a)(b)(c)\2/ 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/ 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$/E Capturing subpattern count = 0 Options: dollar_endonly First char = 'a' Need char = 'c' abc 0: abc *** Failers No match abc\n No match abc\ndef No match /(a)(b)(c)(d)(e)\6/ Failed: back reference to non-existent subpattern at offset 17 /the quick brown fox/ Capturing subpattern count = 0 No options First char = 't' Need char = 'x' the quick brown fox 0: the quick brown fox this is a line with the quick brown fox 0: the quick brown fox /the quick brown fox/A Capturing subpattern count = 0 Options: anchored No first char Need char = 'x' the quick brown fox 0: the quick brown fox *** Failers No match this is a line with the quick brown fox No match /ab(?z)cd/ Failed: unrecognized character after (? at offset 4 /^abc|def/ Capturing subpattern count = 0 No options No first char No need char abcdef 0: abc abcdef\B 0: def /.*((abc)$|(def))/ Capturing subpattern count = 3 No options First char at start or follows \n No need char defabc 0: defabc 1: abc 2: abc \Zdefabc 0: def 1: def 2: 3: def /abc/P abc 0: abc *** Failers No match: POSIX code 17: match failed /^abc|def/P abcdef 0: abc abcdef\B 0: def /.*((abc)$|(def))/P defabc 0: defabc 1: abc 2: abc \Zdefabc 0: def 1: def 3: def /the quick brown fox/P the quick brown fox 0: the quick brown fox *** Failers No match: POSIX code 17: match failed The Quick Brown Fox No match: POSIX code 17: match failed /the quick brown fox/Pi the quick brown fox 0: the quick brown fox The Quick Brown Fox 0: The Quick Brown Fox /abc.def/P *** Failers No match: POSIX code 17: match failed abc\ndef No match: POSIX code 17: match failed /abc$/P abc 0: abc abc\n 0: abc /(abc)\2/P Failed: POSIX code 15: bad back reference at offset 7 /(abc\1)/P 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,}/ Capturing subpattern count = 0 No options No first char No need char co-processors, and for 0: -pr /<.*>/ Capturing subpattern count = 0 No options First char = '<' Need char = '>' abcghinop 0: ghi /<.*?>/ Capturing subpattern count = 0 No options First char = '<' Need char = '>' abcghinop 0: /<.*>/U Capturing subpattern count = 0 Options: ungreedy First char = '<' Need char = '>' abcghinop 0: /<.*>(?U)/ Capturing subpattern count = 0 Options: ungreedy First char = '<' Need char = '>' abcghinop 0: /<.*?>/U Capturing subpattern count = 0 Options: ungreedy First char = '<' Need char = '>' abcghinop 0: ghi /={3,}/U Capturing subpattern count = 0 Options: ungreedy First char = '=' Need char = '=' abc========def 0: === /(?U)={3,}?/ Capturing subpattern count = 0 Options: ungreedy First char = '=' Need char = '=' abc========def 0: ======== /(?^abc)/m Capturing subpattern count = 0 Options: multiline First char at start or follows \n 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/ Capturing subpattern count = 0 No options First char = 'T' Need char = 's' /(?<=bullock|donkey)-cart/ 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)/ Capturing subpattern count = 0 No options Case state changes No first char No need char /(?>.*)(?<=(abcd)|(xyz))/ Capturing subpattern count = 2 No options First char at start or follows \n No need char alphabetabcd 0: alphabetabcd 1: abcd endingxyz 0: endingxyz 1: 2: xyz /(?<=ab(?i)x(?-i)y|(?i)z|b)ZZ/ Capturing subpattern count = 0 No options Case state changes 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/ Capturing subpattern count = 0 Options: anchored No first char Need char = 'f' 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/M Memory allocation (code space): 428 Capturing subpattern count = 8 No options First char = 'w' Need char = 'd' /.*X/D ------------------------------------------------------------------ 0 8 Bra 0 3 Any* 5 1 X 8 8 Ket 11 End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char at start or follows \n Need char = 'X' /.*X/Ds ------------------------------------------------------------------ 0 8 Bra 0 3 Any* 5 1 X 8 8 Ket 11 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored dotall No first char Need char = 'X' /(.*X|^B)/D ------------------------------------------------------------------ 0 21 Bra 0 3 8 Bra 1 6 Any* 8 1 X 11 7 Alt 14 ^ 15 1 B 18 15 Ket 21 21 Ket 24 End ------------------------------------------------------------------ Capturing subpattern count = 1 No options First char at start or follows \n No need char /(.*X|^B)/Ds ------------------------------------------------------------------ 0 21 Bra 0 3 8 Bra 1 6 Any* 8 1 X 11 7 Alt 14 ^ 15 1 B 18 15 Ket 21 21 Ket 24 End ------------------------------------------------------------------ Capturing subpattern count = 1 Options: anchored dotall No first char No need char /(?s)(.*X|^B)/D ------------------------------------------------------------------ 0 21 Bra 0 3 8 Bra 1 6 Any* 8 1 X 11 7 Alt 14 ^ 15 1 B 18 15 Ket 21 21 Ket 24 End ------------------------------------------------------------------ Capturing subpattern count = 1 Options: anchored dotall No first char No need char /(?s:.*X|^B)/D ------------------------------------------------------------------ 0 27 Bra 0 3 10 Bra 0 6 04 Opt 8 Any* 10 1 X 13 9 Alt 16 04 Opt 18 ^ 19 1 B 22 19 Ket 25 00 Opt 27 27 Ket 30 End ------------------------------------------------------------------ Capturing subpattern count = 0 No options First char at start or follows \n No need char /\Biss\B/+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /\Biss\B/+P Mississippi 0: iss 0+ issippi /iss/G+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi 0: iss 0+ ippi /\Biss\B/G+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /\Biss\B/g+ 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/g+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi 0: iss 0+ ippi /(?<=[Ms])iss/G+ Capturing subpattern count = 0 No options First char = 'i' Need char = 's' Mississippi 0: iss 0+ issippi /^iss/g+ Capturing subpattern count = 0 Options: anchored No first char Need char = 's' ississippi 0: iss 0+ issippi /.*iss/g+ Capturing subpattern count = 0 No options First char at start or follows \n Need char = 's' abciss\nxyzisspqr 0: abciss 0+ \x0axyzisspqr 0: xyziss 0+ pqr /.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/+g Capturing subpattern count = 0 Options: anchored No first char Need char = 's' Mississippi 0: Mis 0+ sissippi /^ab\n/g+ Capturing subpattern count = 0 Options: anchored No first char Need char = 10 ab\nab\ncd 0: ab\x0a 0+ ab\x0acd /^ab\n/mg+ Capturing subpattern count = 0 Options: multiline First char at start or follows \n Need char = 10 ab\nab\ncd 0: ab\x0a 0+ ab\x0acd 0: ab\x0a 0+ cd /abc/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /abc|bac/ Capturing subpattern count = 0 No options No first char Need char = 'c' /(abc|bac)/ Capturing subpattern count = 1 No options No first char Need char = 'c' /(abc|(c|dc))/ Capturing subpattern count = 2 No options No first char Need char = 'c' /(abc|(d|de)c)/ Capturing subpattern count = 2 No options No first char Need char = 'c' /a*/ Capturing subpattern count = 0 No options No first char No need char /a+/ Capturing subpattern count = 0 No options First char = 'a' No need char /(baa|a+)/ Capturing subpattern count = 1 No options No first char Need char = 'a' /a{0,3}/ Capturing subpattern count = 0 No options No first char No need char /baa{3,}/ Capturing subpattern count = 0 No options First char = 'b' Need char = 'a' /"([^\\"]+|\\.)*"/ Capturing subpattern count = 1 No options First char = '"' Need char = '"' /(abc|ab[cd])/ Capturing subpattern count = 1 No options First char = 'a' No need char /(a|.)/ Capturing subpattern count = 1 No options No first char No need char /a|ba|\w/ Capturing subpattern count = 0 No options No first char No need char /abc(?=pqr)/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'r' /...(?<=abc)/ Capturing subpattern count = 0 No options No first char No need char /abc(?!pqr)/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'c' /ab./ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /ab[xyz]/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /abc*/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /ab.c*/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /a.c*/ Capturing subpattern count = 0 No options First char = 'a' No need char /.c*/ Capturing subpattern count = 0 No options No first char No need char /ac*/ Capturing subpattern count = 0 No options First char = 'a' No need char /(a.c*|b.c*)/ Capturing subpattern count = 1 No options No first char No need char /a.c*|aba/ Capturing subpattern count = 0 No options First char = 'a' No need char /.+a/ Capturing subpattern count = 0 No options No first char Need char = 'a' /(?=abcda)a.*/ Capturing subpattern count = 0 No options First char = 'a' No need char /(?=a)a.*/ Capturing subpattern count = 0 No options First char = 'a' No need char /a(b)*/ Capturing subpattern count = 1 No options First char = 'a' No need char /a\d*/ Capturing subpattern count = 0 No options First char = 'a' No need char /ab\d*/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /a(\d)*/ Capturing subpattern count = 1 No options First char = 'a' No need char /abcde{0,0}/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'd' /ab\d+/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /a(?(1)b)/ Capturing subpattern count = 0 No options First char = 'a' No need char /a(?(1)bag|big)/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'g' /a(?(1)bag|big)*/ Capturing subpattern count = 0 No options First char = 'a' No need char /a(?(1)bag|big)+/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'g' /a(?(1)b..|b..)/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'b' /ab\d{0}e/ Capturing subpattern count = 0 No options First char = 'a' Need char = 'e' /a?b?/ 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 /|-/ 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)/P 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/S 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 ) /x Capturing subpattern count = 0 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 /\( ( (?>[^()]+) | (?R) )* \) /xg Capturing subpattern count = 1 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 /\( (?: (?>[^()]+) | (?R) ) \) /x Capturing subpattern count = 0 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 /\( (?: (?>[^()]+) | (?R) )? \) /x Capturing subpattern count = 0 Options: extended First char = '(' Need char = ')' () 0: () 12(abcde(fsh)xyz(foo(bar))lmno)89 0: (fsh) /\( ( (?>[^()]+) | (?R) )* \) /x Capturing subpattern count = 1 Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: cd /\( ( ( (?>[^()]+) | (?R) )* ) \) /x Capturing subpattern count = 2 Options: extended First char = '(' Need char = ')' (ab(xy)cd) 0: (ab(xy)cd) 1: ab(xy)cd 2: cd /\( (123)? ( ( (?>[^()]+) | (?R) )* ) \) /x Capturing subpattern count = 3 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 /\( ( (123)? ( (?>[^()]+) | (?R) )* ) \) /x Capturing subpattern count = 3 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 /\( (((((((((( ( (?>[^()]+) | (?R) )* )))))))))) \) /x Capturing subpattern count = 11 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 /\( ( ( (?>[^()<>]+) | ((?>[^()]+)) | (?R) )* ) \) /x Capturing subpattern count = 3 Options: extended First char = '(' Need char = ')' (abcd(xyz

qrs)123) 0: (abcd(xyz

qrs)123) 1: abcd(xyz

qrs)123 2: 123 3:

qrs /\( ( ( (?>[^()]+) | ((?R)) )* ) \) /x Capturing subpattern count = 3 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:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [0-9A-Za-z] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:alpha:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [A-Za-z] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:ascii:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [\x00-\x7f] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:cntrl:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [\x00-\x1f\x7f] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:digit:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [0-9] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:graph:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [!-~] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:lower:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [a-z] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:print:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [ -~] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:punct:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [!-/:-@[-`{-~] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:space:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [\x09-\x0d ] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:upper:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [A-Z] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:xdigit:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [0-9A-Fa-f] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:word:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [0-9A-Z_a-z] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[[:^cntrl:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [ -~\x80-\xff] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /^[12[:^digit:]]/D ------------------------------------------------------------------ 0 37 Bra 0 3 ^ 4 [\x00-/1-2:-\xff] 37 37 Ket 40 End ------------------------------------------------------------------ Capturing subpattern count = 0 Options: anchored No first char No need char /[01[:alpha:]%]/D ------------------------------------------------------------------ 0 36 Bra 0 3 [%0-1A-Za-z] 36 36 Ket 39 End ------------------------------------------------------------------ Capturing subpattern count = 0 No options No first char No need char /[[.ch.]]/ Failed: POSIX collating elements are not supported at offset 1 /[[=ch=]]/ Failed: POSIX collating elements are not supported at offset 1 /[[:rhubarb:]]/ Failed: unknown POSIX class name at offset 3 /[[:upper:]]/i Capturing subpattern count = 0 Options: caseless No first char No need char A 0: A a 0: a /[[:lower:]]/i Capturing subpattern count = 0 Options: caseless No first char No need char A 0: A a 0: a /((?-i)[[:lower:]])[[:lower:]]/i Capturing subpattern count = 1 Options: caseless Case state changes 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-\410]/ Failed: range out of order in character class at offset 9 /^(?(0)f|b)oo/ Failed: invalid condition (?(0) at offset 5 /This one's here because of the large output vector needed/ 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)/ Capturing subpattern count = 271 Max back reference = 270 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/ Capturing subpattern count = 0 No options First char = 'T' Need char = 't' /(main(O)?)+/ Capturing subpattern count = 2 No options First char = 'm' Need char = 'n' mainmain 0: mainmain 1: main mainOmain 0: mainOmain 1: main 2: O / End of testinput2 / Capturing subpattern count = 0 No options First char = ' ' Need char = ' '