105 lines
4.5 KiB
Groff
105 lines
4.5 KiB
Groff
.TH PCRE2_COMPILE 3 "22 April 2022" "PCRE2 10.41"
|
|
.SH NAME
|
|
PCRE2 - Perl-compatible regular expressions (revised API)
|
|
.SH SYNOPSIS
|
|
.rs
|
|
.sp
|
|
.B #include <pcre2.h>
|
|
.PP
|
|
.nf
|
|
.B pcre2_code *pcre2_compile(PCRE2_SPTR \fIpattern\fP, PCRE2_SIZE \fIlength\fP,
|
|
.B " uint32_t \fIoptions\fP, int *\fIerrorcode\fP, PCRE2_SIZE *\fIerroroffset,\fP"
|
|
.B " pcre2_compile_context *\fIccontext\fP);"
|
|
.fi
|
|
.
|
|
.SH DESCRIPTION
|
|
.rs
|
|
.sp
|
|
This function compiles a regular expression pattern into an internal form. Its
|
|
arguments are:
|
|
.sp
|
|
\fIpattern\fP A string containing expression to be compiled
|
|
\fIlength\fP The length of the string or PCRE2_ZERO_TERMINATED
|
|
\fIoptions\fP Option bits
|
|
\fIerrorcode\fP Where to put an error code
|
|
\fIerroffset\fP Where to put an error offset
|
|
\fIccontext\fP Pointer to a compile context or NULL
|
|
.sp
|
|
The length of the pattern and any error offset that is returned are in code
|
|
units, not characters. A compile context is needed only if you want to provide
|
|
custom memory allocation functions, or to provide an external function for
|
|
system stack size checking, or to change one or more of these parameters:
|
|
.sp
|
|
What \eR matches (Unicode newlines, or CR, LF, CRLF only);
|
|
PCRE2's character tables;
|
|
The newline character sequence;
|
|
The compile time nested parentheses limit;
|
|
The maximum pattern length (in code units) that is allowed.
|
|
The additional options bits (see pcre2_set_compile_extra_options())
|
|
.sp
|
|
The option bits are:
|
|
.sp
|
|
PCRE2_ANCHORED Force pattern anchoring
|
|
PCRE2_ALLOW_EMPTY_CLASS Allow empty classes
|
|
PCRE2_ALT_BSUX Alternative handling of \eu, \eU, and \ex
|
|
PCRE2_ALT_CIRCUMFLEX Alternative handling of ^ in multiline mode
|
|
PCRE2_ALT_VERBNAMES Process backslashes in verb names
|
|
PCRE2_AUTO_CALLOUT Compile automatic callouts
|
|
PCRE2_CASELESS Do caseless matching
|
|
PCRE2_DOLLAR_ENDONLY $ not to match newline at end
|
|
PCRE2_DOTALL . matches anything including NL
|
|
PCRE2_DUPNAMES Allow duplicate names for subpatterns
|
|
PCRE2_ENDANCHORED Pattern can match only at end of subject
|
|
PCRE2_EXTENDED Ignore white space and # comments
|
|
PCRE2_FIRSTLINE Force matching to be before newline
|
|
PCRE2_LITERAL Pattern characters are all literal
|
|
PCRE2_MATCH_INVALID_UTF Enable support for matching invalid UTF
|
|
PCRE2_MATCH_UNSET_BACKREF Match unset backreferences
|
|
PCRE2_MULTILINE ^ and $ match newlines within data
|
|
PCRE2_NEVER_BACKSLASH_C Lock out the use of \eC in patterns
|
|
PCRE2_NEVER_UCP Lock out PCRE2_UCP, e.g. via (*UCP)
|
|
PCRE2_NEVER_UTF Lock out PCRE2_UTF, e.g. via (*UTF)
|
|
PCRE2_NO_AUTO_CAPTURE Disable numbered capturing paren-
|
|
theses (named ones available)
|
|
PCRE2_NO_AUTO_POSSESS Disable auto-possessification
|
|
PCRE2_NO_DOTSTAR_ANCHOR Disable automatic anchoring for .*
|
|
PCRE2_NO_START_OPTIMIZE Disable match-time start optimizations
|
|
PCRE2_NO_UTF_CHECK Do not check the pattern for UTF validity
|
|
(only relevant if PCRE2_UTF is set)
|
|
PCRE2_UCP Use Unicode properties for \ed, \ew, etc.
|
|
PCRE2_UNGREEDY Invert greediness of quantifiers
|
|
PCRE2_USE_OFFSET_LIMIT Enable offset limit for unanchored matching
|
|
PCRE2_UTF Treat pattern and subjects as UTF strings
|
|
.sp
|
|
PCRE2 must be built with Unicode support (the default) in order to use
|
|
PCRE2_UTF, PCRE2_UCP and related options.
|
|
.P
|
|
Additional options may be set in the compile context via the
|
|
.\" HREF
|
|
\fBpcre2_set_compile_extra_options\fP
|
|
.\"
|
|
function.
|
|
.P
|
|
If either of \fIerrorcode\fP or \fIerroroffset\fP is NULL, the function returns
|
|
NULL immediately. Otherwise, the yield of this function is a pointer to a
|
|
private data structure that contains the compiled pattern, or NULL if an error
|
|
was detected. In the error case, a text error message can be obtained by
|
|
passing the value returned via the \fIerrorcode\fP argument to the the
|
|
\fBpcre2_get_error_message()\fP function. The offset (in code units) where the
|
|
error was encountered is returned via the \fIerroroffset\fP argument.
|
|
.P
|
|
If there is no error, the value passed via \fIerrorcode\fP returns the message
|
|
"no error" if passed to \fBpcre2_get_error_message()\fP, and the value passed
|
|
via \fIerroroffset\fP is zero.
|
|
.P
|
|
There is a complete description of the PCRE2 native API, with more detail on
|
|
each option, in the
|
|
.\" HREF
|
|
\fBpcre2api\fP
|
|
.\"
|
|
page, and a description of the POSIX API in the
|
|
.\" HREF
|
|
\fBpcre2posix\fP
|
|
.\"
|
|
page.
|