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-.TH PCRESYNTAX 3 "08 January 2014" "PCRE 8.35"
-.SH NAME
-PCRE - Perl-compatible regular expressions
-.SH "PCRE REGULAR EXPRESSION SYNTAX SUMMARY"
-.rs
-.sp
-The full syntax and semantics of the regular expressions that are supported by
-PCRE are described in the
-.\" HREF
-\fBpcrepattern\fP
-.\"
-documentation. This document contains a quick-reference summary of the syntax.
-.
-.
-.SH "QUOTING"
-.rs
-.sp
-  \ex         where x is non-alphanumeric is a literal x
-  \eQ...\eE    treat enclosed characters as literal
-.
-.
-.SH "CHARACTERS"
-.rs
-.sp
-  \ea         alarm, that is, the BEL character (hex 07)
-  \ecx        "control-x", where x is any ASCII character
-  \ee         escape (hex 1B)
-  \ef         form feed (hex 0C)
-  \en         newline (hex 0A)
-  \er         carriage return (hex 0D)
-  \et         tab (hex 09)
-  \e0dd       character with octal code 0dd
-  \eddd       character with octal code ddd, or backreference
-  \eo{ddd..}  character with octal code ddd..
-  \exhh       character with hex code hh
-  \ex{hhh..}  character with hex code hhh..
-.sp
-Note that \e0dd is always an octal code, and that \e8 and \e9 are the literal
-characters "8" and "9".
-.
-.
-.SH "CHARACTER TYPES"
-.rs
-.sp
-  .          any character except newline;
-               in dotall mode, any character whatsoever
-  \eC         one data unit, even in UTF mode (best avoided)
-  \ed         a decimal digit
-  \eD         a character that is not a decimal digit
-  \eh         a horizontal white space character
-  \eH         a character that is not a horizontal white space character
-  \eN         a character that is not a newline
-  \ep{\fIxx\fP}     a character with the \fIxx\fP property
-  \eP{\fIxx\fP}     a character without the \fIxx\fP property
-  \eR         a newline sequence
-  \es         a white space character
-  \eS         a character that is not a white space character
-  \ev         a vertical white space character
-  \eV         a character that is not a vertical white space character
-  \ew         a "word" character
-  \eW         a "non-word" character
-  \eX         a Unicode extended grapheme cluster
-.sp
-By default, \ed, \es, and \ew 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, \es and \ew 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.
-.
-.
-.SH "GENERAL CATEGORY PROPERTIES FOR \ep and \eP"
-.rs
-.sp
-  C          Other
-  Cc         Control
-  Cf         Format
-  Cn         Unassigned
-  Co         Private use
-  Cs         Surrogate
-.sp
-  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
-.sp
-  M          Mark
-  Mc         Spacing mark
-  Me         Enclosing mark
-  Mn         Non-spacing mark
-.sp
-  N          Number
-  Nd         Decimal number
-  Nl         Letter number
-  No         Other number
-.sp
-  P          Punctuation
-  Pc         Connector punctuation
-  Pd         Dash punctuation
-  Pe         Close punctuation
-  Pf         Final punctuation
-  Pi         Initial punctuation
-  Po         Other punctuation
-  Ps         Open punctuation
-.sp
-  S          Symbol
-  Sc         Currency symbol
-  Sk         Modifier symbol
-  Sm         Mathematical symbol
-  So         Other symbol
-.sp
-  Z          Separator
-  Zl         Line separator
-  Zp         Paragraph separator
-  Zs         Space separator
-.
-.
-.SH "PCRE SPECIAL CATEGORY PROPERTIES FOR \ep and \eP"
-.rs
-.sp
-  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        Univerally-named character: one that can be
-               represented by a Universal Character Name
-  Xwd        Perl word: property Xan or underscore
-.sp
-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.
-.
-.
-.SH "SCRIPT NAMES FOR \ep AND \eP"
-.rs
-.sp
-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.
-.
-.
-.SH "CHARACTER CLASSES"
-.rs
-.sp
-  [...]       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
-.sp
-  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 \ew
-  xdigit      hexadecimal digit
-.sp
-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
-\eQ...\eE inside a character class.
-.
-.
-.SH "QUANTIFIERS"
-.rs
-.sp
-  ?           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
-.
-.
-.SH "ANCHORS AND SIMPLE ASSERTIONS"
-.rs
-.sp
-  \eb          word boundary
-  \eB          not a word boundary
-  ^           start of subject
-               also after internal newline in multiline mode
-  \eA          start of subject
-  $           end of subject
-               also before newline at end of subject
-               also before internal newline in multiline mode
-  \eZ          end of subject
-               also before newline at end of subject
-  \ez          end of subject
-  \eG          first matching position in subject
-.
-.
-.SH "MATCH POINT RESET"
-.rs
-.sp
-  \eK          reset start of match
-.sp
-\eK is honoured in positive assertions, but ignored in negative ones.
-.
-.
-.SH "ALTERNATION"
-.rs
-.sp
-  expr|expr|expr...
-.
-.
-.SH "CAPTURING"
-.rs
-.sp
-  (...)           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
-.
-.
-.SH "ATOMIC GROUPS"
-.rs
-.sp
-  (?>...)         atomic, non-capturing group
-.
-.
-.
-.
-.SH "COMMENT"
-.rs
-.sp
-  (?#....)        comment (not nestable)
-.
-.
-.SH "OPTION SETTING"
-.rs
-.sp
-  (?i)            caseless
-  (?J)            allow duplicate names
-  (?m)            multiline
-  (?s)            single line (dotall)
-  (?U)            default ungreedy (lazy)
-  (?x)            extended (ignore white space)
-  (?-...)         unset option(s)
-.sp
-The following are recognized only at the very start of a pattern or after one
-of the newline or \eR options with similar syntax. More than one of them may
-appear.
-.sp
-  (*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 \ed etc)
-.sp
-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.
-.
-.
-.SH "NEWLINE CONVENTION"
-.rs
-.sp
-These are recognized only at the very start of the pattern or after option
-settings with a similar syntax.
-.sp
-  (*CR)           carriage return only
-  (*LF)           linefeed only
-  (*CRLF)         carriage return followed by linefeed
-  (*ANYCRLF)      all three of the above
-  (*ANY)          any Unicode newline sequence
-.
-.
-.SH "WHAT \eR MATCHES"
-.rs
-.sp
-These are recognized only at the very start of the pattern or after option
-setting with a similar syntax.
-.sp
-  (*BSR_ANYCRLF)  CR, LF, or CRLF
-  (*BSR_UNICODE)  any Unicode newline sequence
-.
-.
-.SH "LOOKAHEAD AND LOOKBEHIND ASSERTIONS"
-.rs
-.sp
-  (?=...)         positive look ahead
-  (?!...)         negative look ahead
-  (?<=...)        positive look behind
-  (?<!...)        negative look behind
-.sp
-Each top-level branch of a look behind must be of a fixed length.
-.
-.
-.SH "BACKREFERENCES"
-.rs
-.sp
-  \en              reference by number (can be ambiguous)
-  \egn             reference by number
-  \eg{n}           reference by number
-  \eg{-n}          relative reference by number
-  \ek<name>        reference by name (Perl)
-  \ek'name'        reference by name (Perl)
-  \eg{name}        reference by name (Perl)
-  \ek{name}        reference by name (.NET)
-  (?P=name)       reference by name (Python)
-.
-.
-.SH "SUBROUTINE REFERENCES (POSSIBLY RECURSIVE)"
-.rs
-.sp
-  (?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)
-  \eg<name>        call subpattern by name (Oniguruma)
-  \eg'name'        call subpattern by name (Oniguruma)
-  \eg<n>           call subpattern by absolute number (Oniguruma)
-  \eg'n'           call subpattern by absolute number (Oniguruma)
-  \eg<+n>          call subpattern by relative number (PCRE extension)
-  \eg'+n'          call subpattern by relative number (PCRE extension)
-  \eg<-n>          call subpattern by relative number (PCRE extension)
-  \eg'-n'          call subpattern by relative number (PCRE extension)
-.
-.
-.SH "CONDITIONAL PATTERNS"
-.rs
-.sp
-  (?(condition)yes-pattern)
-  (?(condition)yes-pattern|no-pattern)
-.sp
-  (?(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
-.
-.
-.SH "BACKTRACKING CONTROL"
-.rs
-.sp
-The following act immediately they are reached:
-.sp
-  (*ACCEPT)       force successful match
-  (*FAIL)         force backtrack; synonym (*F)
-  (*MARK:NAME)    set name to be passed back; synonym (*:NAME)
-.sp
-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.
-.sp
-  (*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)
-.
-.
-.SH "CALLOUTS"
-.rs
-.sp
-  (?C)      callout
-  (?Cn)     callout with data n
-.
-.
-.SH "SEE ALSO"
-.rs
-.sp
-\fBpcrepattern\fP(3), \fBpcreapi\fP(3), \fBpcrecallout\fP(3),
-\fBpcrematching\fP(3), \fBpcre\fP(3).
-.
-.
-.SH AUTHOR
-.rs
-.sp
-.nf
-Philip Hazel
-University Computing Service
-Cambridge CB2 3QH, England.
-.fi
-.
-.
-.SH REVISION
-.rs
-.sp
-.nf
-Last updated: 08 January 2014
-Copyright (c) 1997-2014 University of Cambridge.
-.fi