672 lines
18 KiB
Groff
672 lines
18 KiB
Groff
.TH PCRE2SYNTAX 3 "12 July 2019" "PCRE2 10.34"
|
|
.SH NAME
|
|
PCRE2 - Perl-compatible regular expressions (revised API)
|
|
.SH "PCRE2 REGULAR EXPRESSION SYNTAX SUMMARY"
|
|
.rs
|
|
.sp
|
|
The full syntax and semantics of the regular expressions that are supported by
|
|
PCRE2 are described in the
|
|
.\" HREF
|
|
\fBpcre2pattern\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 "ESCAPED CHARACTERS"
|
|
.rs
|
|
.sp
|
|
This table applies to ASCII and Unicode environments. An unrecognized escape
|
|
sequence causes an error.
|
|
.sp
|
|
\ea alarm, that is, the BEL character (hex 07)
|
|
\ecx "control-x", where x is any ASCII printing 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..
|
|
\eN{U+hh..} character with Unicode code point hh.. (Unicode mode only)
|
|
\exhh character with hex code hh
|
|
\ex{hh..} character with hex code hh..
|
|
.sp
|
|
If PCRE2_ALT_BSUX or PCRE2_EXTRA_ALT_BSUX is set ("ALT_BSUX mode"), the
|
|
following are also recognized:
|
|
.sp
|
|
\eU the character "U"
|
|
\euhhhh character with hex code hhhh
|
|
\eu{hh..} character with hex code hh.. but only for EXTRA_ALT_BSUX
|
|
.sp
|
|
When \ex is not followed by {, from zero to two hexadecimal digits are read,
|
|
but in ALT_BSUX mode \ex must be followed by two hexadecimal digits to be
|
|
recognized as a hexadecimal escape; otherwise it matches a literal "x".
|
|
Likewise, if \eu (in ALT_BSUX mode) is not followed by four hexadecimal digits
|
|
or (in EXTRA_ALT_BSUX mode) a sequence of hex digits in curly brackets, it
|
|
matches a literal "u".
|
|
.P
|
|
Note that \e0dd is always an octal code. The treatment of backslash followed by
|
|
a non-zero digit is complicated; for details see the section
|
|
.\" HTML <a href="pcre2pattern.html#digitsafterbackslash">
|
|
.\" </a>
|
|
"Non-printing characters"
|
|
.\"
|
|
in the
|
|
.\" HREF
|
|
\fBpcre2pattern\fP
|
|
.\"
|
|
documentation, where details of escape processing in EBCDIC environments are
|
|
also given. \eN{U+hh..} is synonymous with \ex{hh..} in PCRE2 but is not
|
|
supported in EBCDIC environments. Note that \eN not followed by an opening
|
|
curly bracket has a different meaning (see below).
|
|
.
|
|
.
|
|
.SH "CHARACTER TYPES"
|
|
.rs
|
|
.sp
|
|
. any character except newline;
|
|
in dotall mode, any character whatsoever
|
|
\eC one code 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
|
|
\eC is dangerous because it may leave the current matching point in the middle
|
|
of a UTF-8 or UTF-16 character. The application can lock out the use of \eC by
|
|
setting the PCRE2_NEVER_BACKSLASH_C option. It is also possible to build PCRE2
|
|
with the use of \eC permanently disabled.
|
|
.P
|
|
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 PCRE2_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 "PCRE2 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.
|
|
.
|
|
.
|
|
.SH "SCRIPT NAMES FOR \ep AND \eP"
|
|
.rs
|
|
.sp
|
|
Adlam,
|
|
Ahom,
|
|
Anatolian_Hieroglyphs,
|
|
Arabic,
|
|
Armenian,
|
|
Avestan,
|
|
Balinese,
|
|
Bamum,
|
|
Bassa_Vah,
|
|
Batak,
|
|
Bengali,
|
|
Bhaiksuki,
|
|
Bopomofo,
|
|
Brahmi,
|
|
Braille,
|
|
Buginese,
|
|
Buhid,
|
|
Canadian_Aboriginal,
|
|
Carian,
|
|
Caucasian_Albanian,
|
|
Chakma,
|
|
Cham,
|
|
Cherokee,
|
|
Common,
|
|
Coptic,
|
|
Cuneiform,
|
|
Cypriot,
|
|
Cyrillic,
|
|
Deseret,
|
|
Devanagari,
|
|
Dogra,
|
|
Duployan,
|
|
Egyptian_Hieroglyphs,
|
|
Elbasan,
|
|
Ethiopic,
|
|
Georgian,
|
|
Glagolitic,
|
|
Gothic,
|
|
Grantha,
|
|
Greek,
|
|
Gujarati,
|
|
Gunjala_Gondi,
|
|
Gurmukhi,
|
|
Han,
|
|
Hangul,
|
|
Hanifi_Rohingya,
|
|
Hanunoo,
|
|
Hatran,
|
|
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,
|
|
Makasar,
|
|
Malayalam,
|
|
Mandaic,
|
|
Manichaean,
|
|
Marchen,
|
|
Masaram_Gondi,
|
|
Medefaidrin,
|
|
Meetei_Mayek,
|
|
Mende_Kikakui,
|
|
Meroitic_Cursive,
|
|
Meroitic_Hieroglyphs,
|
|
Miao,
|
|
Modi,
|
|
Mongolian,
|
|
Mro,
|
|
Multani,
|
|
Myanmar,
|
|
Nabataean,
|
|
New_Tai_Lue,
|
|
Newa,
|
|
Nko,
|
|
Nushu,
|
|
Ogham,
|
|
Ol_Chiki,
|
|
Old_Hungarian,
|
|
Old_Italic,
|
|
Old_North_Arabian,
|
|
Old_Permic,
|
|
Old_Persian,
|
|
Old_Sogdian,
|
|
Old_South_Arabian,
|
|
Old_Turkic,
|
|
Oriya,
|
|
Osage,
|
|
Osmanya,
|
|
Pahawh_Hmong,
|
|
Palmyrene,
|
|
Pau_Cin_Hau,
|
|
Phags_Pa,
|
|
Phoenician,
|
|
Psalter_Pahlavi,
|
|
Rejang,
|
|
Runic,
|
|
Samaritan,
|
|
Saurashtra,
|
|
Sharada,
|
|
Shavian,
|
|
Siddham,
|
|
SignWriting,
|
|
Sinhala,
|
|
Sogdian,
|
|
Sora_Sompeng,
|
|
Soyombo,
|
|
Sundanese,
|
|
Syloti_Nagri,
|
|
Syriac,
|
|
Tagalog,
|
|
Tagbanwa,
|
|
Tai_Le,
|
|
Tai_Tham,
|
|
Tai_Viet,
|
|
Takri,
|
|
Tamil,
|
|
Tangut,
|
|
Telugu,
|
|
Thaana,
|
|
Thai,
|
|
Tibetan,
|
|
Tifinagh,
|
|
Tirhuta,
|
|
Ugaritic,
|
|
Vai,
|
|
Warang_Citi,
|
|
Yi,
|
|
Zanabazar_Square.
|
|
.
|
|
.
|
|
.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 PCRE2, POSIX character set names recognize only ASCII characters by default,
|
|
but some of them use Unicode properties if PCRE2_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 an internal newline in multiline mode
|
|
(after any newline if PCRE2_ALT_CIRCUMFLEX is set)
|
|
\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 "REPORTED MATCH POINT SETTING"
|
|
.rs
|
|
.sp
|
|
\eK set reported 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
|
|
(...) capture group
|
|
(?<name>...) named capture group (Perl)
|
|
(?'name'...) named capture group (Perl)
|
|
(?P<name>...) named capture group (Python)
|
|
(?:...) non-capture group
|
|
(?|...) non-capture group; reset group numbers for
|
|
capture groups in each alternative
|
|
.sp
|
|
In non-UTF modes, names may contain underscores and ASCII letters and digits;
|
|
in UTF modes, any Unicode letters and Unicode decimal digits are permitted. In
|
|
both cases, a name must not start with a digit.
|
|
.
|
|
.
|
|
.SH "ATOMIC GROUPS"
|
|
.rs
|
|
.sp
|
|
(?>...) atomic non-capture group
|
|
(*atomic:...) atomic non-capture group
|
|
.
|
|
.
|
|
.SH "COMMENT"
|
|
.rs
|
|
.sp
|
|
(?#....) comment (not nestable)
|
|
.
|
|
.
|
|
.SH "OPTION SETTING"
|
|
.rs
|
|
Changes of these options within a group are automatically cancelled at the end
|
|
of the group.
|
|
.sp
|
|
(?i) caseless
|
|
(?J) allow duplicate names
|
|
(?m) multiline
|
|
(?n) no auto capture
|
|
(?s) single line (dotall)
|
|
(?U) default ungreedy (lazy)
|
|
(?x) extended: ignore white space except in classes
|
|
(?xx) as (?x) but also ignore space and tab in classes
|
|
(?-...) unset option(s)
|
|
(?^) unset imnsx options
|
|
.sp
|
|
Unsetting x or xx unsets both. Several options may be set at once, and a
|
|
mixture of setting and unsetting such as (?i-x) is allowed, but there may be
|
|
only one hyphen. Setting (but no unsetting) is allowed after (?^ for example
|
|
(?^in). An option setting may appear at the start of a non-capture group, for
|
|
example (?i:...).
|
|
.P
|
|
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. For the first three, d is a decimal number.
|
|
.sp
|
|
(*LIMIT_DEPTH=d) set the backtracking limit to d
|
|
(*LIMIT_HEAP=d) set the heap size limit to d * 1024 bytes
|
|
(*LIMIT_MATCH=d) set the match limit to d
|
|
(*NOTEMPTY) set PCRE2_NOTEMPTY when matching
|
|
(*NOTEMPTY_ATSTART) set PCRE2_NOTEMPTY_ATSTART when matching
|
|
(*NO_AUTO_POSSESS) no auto-possessification (PCRE2_NO_AUTO_POSSESS)
|
|
(*NO_DOTSTAR_ANCHOR) no .* anchoring (PCRE2_NO_DOTSTAR_ANCHOR)
|
|
(*NO_JIT) disable JIT optimization
|
|
(*NO_START_OPT) no start-match optimization (PCRE2_NO_START_OPTIMIZE)
|
|
(*UTF) set appropriate UTF mode for the library in use
|
|
(*UCP) set PCRE2_UCP (use Unicode properties for \ed etc)
|
|
.sp
|
|
Note that LIMIT_DEPTH, LIMIT_HEAP, and LIMIT_MATCH can only reduce the value of
|
|
the limits set by the caller of \fBpcre2_match()\fP or \fBpcre2_dfa_match()\fP,
|
|
not increase them. LIMIT_RECURSION is an obsolete synonym for LIMIT_DEPTH. The
|
|
application can lock out the use of (*UTF) and (*UCP) by setting the
|
|
PCRE2_NEVER_UTF or PCRE2_NEVER_UCP options, respectively, at compile time.
|
|
.
|
|
.
|
|
.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
|
|
(*NUL) the NUL character (binary zero)
|
|
.
|
|
.
|
|
.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
|
|
(?=...) )
|
|
(*pla:...) ) positive lookahead
|
|
(*positive_lookahead:...) )
|
|
.sp
|
|
(?!...) )
|
|
(*nla:...) ) negative lookahead
|
|
(*negative_lookahead:...) )
|
|
.sp
|
|
(?<=...) )
|
|
(*plb:...) ) positive lookbehind
|
|
(*positive_lookbehind:...) )
|
|
.sp
|
|
(?<!...) )
|
|
(*nlb:...) ) negative lookbehind
|
|
(*negative_lookbehind:...) )
|
|
.sp
|
|
Each top-level branch of a lookbehind must be of a fixed length.
|
|
.
|
|
.
|
|
.SH "NON-ATOMIC LOOKAROUND ASSERTIONS"
|
|
.rs
|
|
.sp
|
|
These assertions are specific to PCRE2 and are not Perl-compatible.
|
|
.sp
|
|
(*napla:...)
|
|
(*non_atomic_positive_lookahead:...)
|
|
.sp
|
|
(*naplb:...)
|
|
(*non_atomic_positive_lookbehind:...)
|
|
.
|
|
.
|
|
.SH "SCRIPT RUNS"
|
|
.rs
|
|
.sp
|
|
(*script_run:...) ) script run, can be backtracked into
|
|
(*sr:...) )
|
|
.sp
|
|
(*atomic_script_run:...) ) atomic script run
|
|
(*asr:...) )
|
|
.
|
|
.
|
|
.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 (PCRE2 extension)
|
|
\eg-n relative reference by number
|
|
\eg{+n} relative reference by number (PCRE2 extension)
|
|
\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 subroutine by absolute number
|
|
(?+n) call subroutine by relative number
|
|
(?-n) call subroutine by relative number
|
|
(?&name) call subroutine by name (Perl)
|
|
(?P>name) call subroutine by name (Python)
|
|
\eg<name> call subroutine by name (Oniguruma)
|
|
\eg'name' call subroutine by name (Oniguruma)
|
|
\eg<n> call subroutine by absolute number (Oniguruma)
|
|
\eg'n' call subroutine by absolute number (Oniguruma)
|
|
\eg<+n> call subroutine by relative number (PCRE2 extension)
|
|
\eg'+n' call subroutine by relative number (PCRE2 extension)
|
|
\eg<-n> call subroutine by relative number (PCRE2 extension)
|
|
\eg'-n' call subroutine by relative number (PCRE2 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 (PCRE2, deprecated)
|
|
(?(R) overall recursion condition
|
|
(?(Rn) specific numbered group recursion condition
|
|
(?(R&name) specific named group recursion condition
|
|
(?(DEFINE) define groups for reference
|
|
(?(VERSION[>]=n.m) test PCRE2 version
|
|
(?(assert) assertion condition
|
|
.sp
|
|
Note the ambiguity of (?(R) and (?(Rn) which might be named reference
|
|
conditions or recursion tests. Such a condition is interpreted as a reference
|
|
condition if the relevant named group exists.
|
|
.
|
|
.
|
|
.SH "BACKTRACKING CONTROL"
|
|
.rs
|
|
.sp
|
|
All backtracking control verbs may be in the form (*VERB:NAME). For (*MARK) the
|
|
name is mandatory, for the others it is optional. (*SKIP) changes its behaviour
|
|
if :NAME is present. The others just set a name for passing back to the caller,
|
|
but this is not a name that (*SKIP) can see. 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
|
|
(*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
|
|
.sp
|
|
The effect of one of these verbs in a group called as a subroutine is confined
|
|
to the subroutine call.
|
|
.
|
|
.
|
|
.SH "CALLOUTS"
|
|
.rs
|
|
.sp
|
|
(?C) callout (assumed number 0)
|
|
(?Cn) callout with numerical data n
|
|
(?C"text") callout with string data
|
|
.sp
|
|
The allowed string delimiters are ` ' " ^ % # $ (which are the same for the
|
|
start and the end), and the starting delimiter { matched with the ending
|
|
delimiter }. To encode the ending delimiter within the string, double it.
|
|
.
|
|
.
|
|
.SH "SEE ALSO"
|
|
.rs
|
|
.sp
|
|
\fBpcre2pattern\fP(3), \fBpcre2api\fP(3), \fBpcre2callout\fP(3),
|
|
\fBpcre2matching\fP(3), \fBpcre2\fP(3).
|
|
.
|
|
.
|
|
.SH AUTHOR
|
|
.rs
|
|
.sp
|
|
.nf
|
|
Philip Hazel
|
|
University Computing Service
|
|
Cambridge, England.
|
|
.fi
|
|
.
|
|
.
|
|
.SH REVISION
|
|
.rs
|
|
.sp
|
|
.nf
|
|
Last updated: 12 July 2019
|
|
Copyright (c) 1997-2019 University of Cambridge.
|
|
.fi
|