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authorIan Jackson <ijackson@chiark.greenend.org.uk>2016-07-13 21:24:43 +0100
committerIan Jackson <ijackson@chiark.greenend.org.uk>2016-07-13 21:24:43 +0100
commitcba4af1b7643b0da036ff78fd152f74a906c4e97 (patch)
tree84f90cc1a9542b2f374932b04ea0752eabbd3741 /doc/pcre_exec.3
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+.TH PCRE_EXEC 3 "12 May 2013" "PCRE 8.33"
+.SH NAME
+PCRE - Perl-compatible regular expressions
+.SH SYNOPSIS
+.rs
+.sp
+.B #include <pcre.h>
+.PP
+.nf
+.B int pcre_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP,"
+.B " const char *\fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
+.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);"
+.sp
+.B int pcre16_exec(const pcre16 *\fIcode\fP, "const pcre16_extra *\fIextra\fP,"
+.B " PCRE_SPTR16 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
+.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);"
+.sp
+.B int pcre32_exec(const pcre32 *\fIcode\fP, "const pcre32_extra *\fIextra\fP,"
+.B " PCRE_SPTR32 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
+.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);"
+.fi
+.
+.SH DESCRIPTION
+.rs
+.sp
+This function matches a compiled regular expression against a given subject
+string, using a matching algorithm that is similar to Perl's. It returns
+offsets to captured substrings. Its arguments are:
+.sp
+ \fIcode\fP Points to the compiled pattern
+ \fIextra\fP Points to an associated \fBpcre[16|32]_extra\fP structure,
+ or is NULL
+ \fIsubject\fP Points to the subject string
+ \fIlength\fP Length of the subject string
+ \fIstartoffset\fP Offset in the subject at which to start matching
+ \fIoptions\fP Option bits
+ \fIovector\fP Points to a vector of ints for result offsets
+ \fIovecsize\fP Number of elements in the vector (a multiple of 3)
+.sp
+The units for \fIlength\fP and \fIstartoffset\fP are bytes for
+\fBpcre_exec()\fP, 16-bit data items for \fBpcre16_exec()\fP, and 32-bit items
+for \fBpcre32_exec()\fP. The options are:
+.sp
+ PCRE_ANCHORED Match only at the first position
+ PCRE_BSR_ANYCRLF \eR matches only CR, LF, or CRLF
+ PCRE_BSR_UNICODE \eR matches all Unicode line endings
+ PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
+ PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
+ PCRE_NEWLINE_CR Recognize CR as the only newline sequence
+ PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
+ PCRE_NEWLINE_LF Recognize LF as the only newline sequence
+ PCRE_NOTBOL Subject string is not the beginning of a line
+ PCRE_NOTEOL Subject string is not the end of a line
+ PCRE_NOTEMPTY An empty string is not a valid match
+ PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
+ is not a valid match
+ PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
+ PCRE_NO_UTF16_CHECK Do not check the subject for UTF-16
+ validity (only relevant if PCRE_UTF16
+ was set at compile time)
+ PCRE_NO_UTF32_CHECK Do not check the subject for UTF-32
+ validity (only relevant if PCRE_UTF32
+ was set at compile time)
+ PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
+ validity (only relevant if PCRE_UTF8
+ was set at compile time)
+ PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
+ PCRE_PARTIAL_SOFT ) match if no full matches are found
+ PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
+ if that is found before a full match
+.sp
+For details of partial matching, see the
+.\" HREF
+\fBpcrepartial\fP
+.\"
+page. A \fBpcre_extra\fP structure contains the following fields:
+.sp
+ \fIflags\fP Bits indicating which fields are set
+ \fIstudy_data\fP Opaque data from \fBpcre[16|32]_study()\fP
+ \fImatch_limit\fP Limit on internal resource use
+ \fImatch_limit_recursion\fP Limit on internal recursion depth
+ \fIcallout_data\fP Opaque data passed back to callouts
+ \fItables\fP Points to character tables or is NULL
+ \fImark\fP For passing back a *MARK pointer
+ \fIexecutable_jit\fP Opaque data from JIT compilation
+.sp
+The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
+PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA,
+PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT.
+.P
+There is a complete description of the PCRE native API in the
+.\" HREF
+\fBpcreapi\fP
+.\"
+page and a description of the POSIX API in the
+.\" HREF
+\fBpcreposix\fP
+.\"
+page.