NAME

PCRE - Perl-compatible regular expressions

PCRE REGULAR EXPRESSION SYNTAX SUMMARY

The full syntax and semantics of the regular expressions that are supported by PCRE are described in the pcrepattern documentation. This document contains a quick-reference summary of the syntax.

QUOTING

\x where x is non-alphanumeric is a literal x \Q...\E treat enclosed characters as literal

CHARACTERS

\a alarm, that is, the BEL character (hex 07) \cx "control-x", where x is any ASCII character \e escape (hex 1B) \f form feed (hex 0C) \n newline (hex 0A) \r carriage return (hex 0D) \t tab (hex 09) \0dd character with octal code 0dd \ddd character with octal code ddd, or backreference \o{ddd..} character with octal code ddd.. \xhh character with hex code hh \x{hhh..} character with hex code hhh..

Note that \0dd is always an octal code, and that \8 and \9 are the literal characters "8" and "9".

CHARACTER TYPES

. any character except newline; in dotall mode, any character whatsoever \C one data unit, even in UTF mode (best avoided) \d a decimal digit \D a character that is not a decimal digit \h a horizontal white space character \H a character that is not a horizontal white space character \N a character that is not a newline \p{xx} a character with the xx property \P{xx} a character without the xx property \R a newline sequence \s a white space character \S a character that is not a white space character \v a vertical white space character \V a character that is not a vertical white space character \w a "word" character \W a "non-word" character \X a Unicode extended grapheme cluster

By default, \d, \s, and \w match only ASCII characters, even in UTF-8 mode or in the 16- bit and 32-bit libraries. However, if locale-specific matching is happening, \s and \w may also match characters with code points in the range 128-255. If the PCRE_UCP option is set, the behaviour of these escape sequences is changed to use Unicode properties and they match many more characters.

GENERAL CATEGORY PROPERTIES FOR \p and \P

C Other Cc Control Cf Format Cn Unassigned Co Private use Cs Surrogate

L Letter Ll Lower case letter Lm Modifier letter Lo Other letter Lt Title case letter Lu Upper case letter L& Ll, Lu, or Lt

M Mark Mc Spacing mark Me Enclosing mark Mn Non-spacing mark

N Number Nd Decimal number Nl Letter number No Other number

P Punctuation Pc Connector punctuation Pd Dash punctuation Pe Close punctuation Pf Final punctuation Pi Initial punctuation Po Other punctuation Ps Open punctuation

S Symbol Sc Currency symbol Sk Modifier symbol Sm Mathematical symbol So Other symbol

Z Separator Zl Line separator Zp Paragraph separator Zs Space separator

PCRE SPECIAL CATEGORY PROPERTIES FOR \p and \P

Xan Alphanumeric: union of properties L and N Xps POSIX space: property Z or tab, NL, VT, FF, CR Xsp Perl space: property Z or tab, NL, VT, FF, CR Xuc Universally-named character: one that can be represented by a Universal Character Name Xwd Perl word: property Xan or underscore

Perl and POSIX space are now the same. Perl added VT to its space character set at release 5.18 and PCRE changed at release 8.34.

SCRIPT NAMES FOR \p AND \P

Arabic, Armenian, Avestan, Balinese, Bamum, Bassa_Vah, Batak, Bengali, Bopomofo, Brahmi, Braille, Buginese, Buhid, Canadian_Aboriginal, Carian, Caucasian_Albanian, Chakma, Cham, Cherokee, Common, Coptic, Cuneiform, Cypriot, Cyrillic, Deseret, Devanagari, Duployan, Egyptian_Hieroglyphs, Elbasan, Ethiopic, Georgian, Glagolitic, Gothic, Grantha, Greek, Gujarati, Gurmukhi, Han, Hangul, Hanunoo, Hebrew, Hiragana, Imperial_Aramaic, Inherited, Inscriptional_Pahlavi, Inscriptional_Parthian, Javanese, Kaithi, Kannada, Katakana, Kayah_Li, Kharoshthi, Khmer, Khojki, Khudawadi, Lao, Latin, Lepcha, Limbu, Linear_A, Linear_B, Lisu, Lycian, Lydian, Mahajani, Malayalam, Mandaic, Manichaean, Meetei_Mayek, Mende_Kikakui, Meroitic_Cursive, Meroitic_Hieroglyphs, Miao, Modi, Mongolian, Mro, Myanmar, Nabataean, New_Tai_Lue, Nko, Ogham, Ol_Chiki, Old_Italic, Old_North_Arabian, Old_Permic, Old_Persian, Old_South_Arabian, Old_Turkic, Oriya, Osmanya, Pahawh_Hmong, Palmyrene, Pau_Cin_Hau, Phags_Pa, Phoenician, Psalter_Pahlavi, Rejang, Runic, Samaritan, Saurashtra, Sharada, Shavian, Siddham, Sinhala, Sora_Sompeng, Sundanese, Syloti_Nagri, Syriac, Tagalog, Tagbanwa, Tai_Le, Tai_Tham, Tai_Viet, Takri, Tamil, Telugu, Thaana, Thai, Tibetan, Tifinagh, Tirhuta, Ugaritic, Vai, Warang_Citi, Yi.

CHARACTER CLASSES

[...] positive character class [^...] negative character class [x-y] range (can be used for hex characters) [[:xxx:]] positive POSIX named set [[:^xxx:]] negative POSIX named set

alnum alphanumeric alpha alphabetic ascii 0-127 blank space or tab cntrl control character digit decimal digit graph printing, excluding space lower lower case letter print printing, including space punct printing, excluding alphanumeric space white space upper upper case letter word same as \w xdigit hexadecimal digit

In PCRE, POSIX character set names recognize only ASCII characters by default, but some of them use Unicode properties if PCRE_UCP is set. You can use \Q...\E inside a character class.

QUANTIFIERS

? 0 or 1, greedy ?+ 0 or 1, possessive ?? 0 or 1, lazy * 0 or more, greedy *+ 0 or more, possessive *? 0 or more, lazy + 1 or more, greedy ++ 1 or more, possessive +? 1 or more, lazy {n} exactly n {n,m} at least n, no more than m, greedy {n,m}+ at least n, no more than m, possessive {n,m}? at least n, no more than m, lazy {n,} n or more, greedy {n,}+ n or more, possessive {n,}? n or more, lazy

ANCHORS AND SIMPLE ASSERTIONS

\b word boundary \B not a word boundary ^ start of subject also after internal newline in multiline mode \A start of subject $ end of subject also before newline at end of subject also before internal newline in multiline mode \Z end of subject also before newline at end of subject \z end of subject \G first matching position in subject

MATCH POINT RESET

\K reset start of match

\K is honoured in positive assertions, but ignored in negative ones.

ALTERNATION

expr|expr|expr...

CAPTURING

(...) capturing group (?<name>...) named capturing group (Perl) (?'name'...) named capturing group (Perl) (?P<name>...) named capturing group (Python) (?:...) non-capturing group (?|...) non-capturing group; reset group numbers for capturing groups in each alternative

ATOMIC GROUPS

(?>...) atomic, non-capturing group

COMMENT

(?#....) comment (not nestable)

OPTION SETTING

(?i) caseless (?J) allow duplicate names (?m) multiline (?s) single line (dotall) (?U) default ungreedy (lazy) (?x) extended (ignore white space) (?-...) unset option(s)

The following are recognized only at the very start of a pattern or after one of the newline or \R options with similar syntax. More than one of them may appear.

(*LIMIT_MATCH=d) set the match limit to d (decimal number) (*LIMIT_RECURSION=d) set the recursion limit to d (decimal number) (*NO_AUTO_POSSESS) no auto-possessification (PCRE_NO_AUTO_POSSESS) (*NO_START_OPT) no start-match optimization (PCRE_NO_START_OPTIMIZE) (*UTF8) set UTF-8 mode: 8-bit library (PCRE_UTF8) (*UTF16) set UTF-16 mode: 16-bit library (PCRE_UTF16) (*UTF32) set UTF-32 mode: 32-bit library (PCRE_UTF32) (*UTF) set appropriate UTF mode for the library in use (*UCP) set PCRE_UCP (use Unicode properties for \d etc)

Note that LIMIT_MATCH and LIMIT_RECURSION can only reduce the value of the limits set by the caller of pcre_exec(), not increase them.

NEWLINE CONVENTION

These are recognized only at the very start of the pattern or after option settings with a similar syntax.

(*CR) carriage return only (*LF) linefeed only (*CRLF) carriage return followed by linefeed (*ANYCRLF) all three of the above (*ANY) any Unicode newline sequence

WHAT \R MATCHES

These are recognized only at the very start of the pattern or after option setting with a similar syntax.

(*BSR_ANYCRLF) CR, LF, or CRLF (*BSR_UNICODE) any Unicode newline sequence

LOOKAHEAD AND LOOKBEHIND ASSERTIONS

(?=...) positive look ahead (?!...) negative look ahead (?<=...) positive look behind (?<!...) negative look behind

Each top-level branch of a look behind must be of a fixed length.

BACKREFERENCES

\n reference by number (can be ambiguous) \gn reference by number \g{n} reference by number \g{-n} relative reference by number \k<name> reference by name (Perl) \k'name' reference by name (Perl) \g{name} reference by name (Perl) \k{name} reference by name (.NET) (?P=name) reference by name (Python)

SUBROUTINE REFERENCES (POSSIBLY RECURSIVE)

(?R) recurse whole pattern (?n) call subpattern by absolute number (?+n) call subpattern by relative number (?-n) call subpattern by relative number (?&name) call subpattern by name (Perl) (?P>name) call subpattern by name (Python) \g<name> call subpattern by name (Oniguruma) \g'name' call subpattern by name (Oniguruma) \g<n> call subpattern by absolute number (Oniguruma) \g'n' call subpattern by absolute number (Oniguruma) \g<+n> call subpattern by relative number (PCRE extension) \g'+n' call subpattern by relative number (PCRE extension) \g<-n> call subpattern by relative number (PCRE extension) \g'-n' call subpattern by relative number (PCRE extension)

CONDITIONAL PATTERNS

(?(condition)yes-pattern) (?(condition)yes-pattern|no-pattern)

(?(n)... absolute reference condition (?(+n)... relative reference condition (?(-n)... relative reference condition (?(<name>)... named reference condition (Perl) (?('name')... named reference condition (Perl) (?(name)... named reference condition (PCRE) (?(R)... overall recursion condition (?(Rn)... specific group recursion condition (?(R&name)... specific recursion condition (?(DEFINE)... define subpattern for reference (?(assert)... assertion condition

BACKTRACKING CONTROL

The following act immediately they are reached:

(*ACCEPT) force successful match (*FAIL) force backtrack; synonym (*F) (*MARK:NAME) set name to be passed back; synonym (*:NAME)

The following act only when a subsequent match failure causes a backtrack to reach them. They all force a match failure, but they differ in what happens afterwards. Those that advance the start-of-match point do so only if the pattern is not anchored.

(*COMMIT) overall failure, no advance of starting point (*PRUNE) advance to next starting character (*PRUNE:NAME) equivalent to (*MARK:NAME)(*PRUNE) (*SKIP) advance to current matching position (*SKIP:NAME) advance to position corresponding to an earlier (*MARK:NAME); if not found, the (*SKIP) is ignored (*THEN) local failure, backtrack to next alternation (*THEN:NAME) equivalent to (*MARK:NAME)(*THEN)

CALLOUTS

(?C) callout (?Cn) callout with data n

AUTHOR

Philip Hazel
University Computing Service
Cambridge CB2 3QH, England.

REVISION

Last updated: 08 January 2014
Copyright (c) 1997-2014 University of Cambridge.