89 lines
3.7 KiB
Groff
89 lines
3.7 KiB
Groff
.TH PCRE2_COMPILE 3 "16 June 2017" "PCRE2 10.30"
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.SH NAME
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PCRE2 - Perl-compatible regular expressions (revised API)
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.SH SYNOPSIS
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.rs
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.sp
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.B #include <pcre2.h>
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.PP
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.nf
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.B pcre2_code *pcre2_compile(PCRE2_SPTR \fIpattern\fP, PCRE2_SIZE \fIlength\fP,
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.B " uint32_t \fIoptions\fP, int *\fIerrorcode\fP, PCRE2_SIZE *\fIerroroffset,\fP"
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.B " pcre2_compile_context *\fIccontext\fP);"
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.fi
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.
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.SH DESCRIPTION
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.rs
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.sp
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This function compiles a regular expression pattern into an internal form. Its
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arguments are:
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.sp
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\fIpattern\fP A string containing expression to be compiled
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\fIlength\fP The length of the string or PCRE2_ZERO_TERMINATED
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\fIoptions\fP Option bits
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\fIerrorcode\fP Where to put an error code
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\fIerroffset\fP Where to put an error offset
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\fIccontext\fP Pointer to a compile context or NULL
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.sp
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The length of the pattern and any error offset that is returned are in code
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units, not characters. A compile context is needed only if you want to provide
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custom memory allocation functions, or to provide an external function for
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system stack size checking, or to change one or more of these parameters:
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.sp
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What \eR matches (Unicode newlines, or CR, LF, CRLF only);
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PCRE2's character tables;
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The newline character sequence;
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The compile time nested parentheses limit;
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The maximum pattern length (in code units) that is allowed.
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The additional options bits (see pcre2_set_compile_extra_options())
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.sp
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The option bits are:
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.sp
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PCRE2_ANCHORED Force pattern anchoring
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PCRE2_ALLOW_EMPTY_CLASS Allow empty classes
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PCRE2_ALT_BSUX Alternative handling of \eu, \eU, and \ex
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PCRE2_ALT_CIRCUMFLEX Alternative handling of ^ in multiline mode
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PCRE2_ALT_VERBNAMES Process backslashes in verb names
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PCRE2_AUTO_CALLOUT Compile automatic callouts
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PCRE2_CASELESS Do caseless matching
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PCRE2_DOLLAR_ENDONLY $ not to match newline at end
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PCRE2_DOTALL . matches anything including NL
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PCRE2_DUPNAMES Allow duplicate names for subpatterns
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PCRE2_ENDANCHORED Pattern can match only at end of subject
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PCRE2_EXTENDED Ignore white space and # comments
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PCRE2_FIRSTLINE Force matching to be before newline
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PCRE2_LITERAL Pattern characters are all literal
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PCRE2_MATCH_UNSET_BACKREF Match unset back references
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PCRE2_MULTILINE ^ and $ match newlines within data
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PCRE2_NEVER_BACKSLASH_C Lock out the use of \eC in patterns
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PCRE2_NEVER_UCP Lock out PCRE2_UCP, e.g. via (*UCP)
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PCRE2_NEVER_UTF Lock out PCRE2_UTF, e.g. via (*UTF)
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PCRE2_NO_AUTO_CAPTURE Disable numbered capturing paren-
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theses (named ones available)
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PCRE2_NO_AUTO_POSSESS Disable auto-possessification
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PCRE2_NO_DOTSTAR_ANCHOR Disable automatic anchoring for .*
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PCRE2_NO_START_OPTIMIZE Disable match-time start optimizations
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PCRE2_NO_UTF_CHECK Do not check the pattern for UTF validity
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(only relevant if PCRE2_UTF is set)
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PCRE2_UCP Use Unicode properties for \ed, \ew, etc.
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PCRE2_UNGREEDY Invert greediness of quantifiers
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PCRE2_USE_OFFSET_LIMIT Enable offset limit for unanchored matching
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PCRE2_UTF Treat pattern and subjects as UTF strings
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.sp
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PCRE2 must be built with Unicode support (the default) in order to use
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PCRE2_UTF, PCRE2_UCP and related options.
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.P
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The yield of the function is a pointer to a private data structure that
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contains the compiled pattern, or NULL if an error was detected.
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.P
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There is a complete description of the PCRE2 native API, with more detail on
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each option, in the
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.\" HREF
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\fBpcre2api\fP
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.\"
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page, and a description of the POSIX API in the
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.\" HREF
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\fBpcre2posix\fP
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.\"
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page.
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