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.TH PCRE_EXEC 3
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.SH NAME
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PCRE - Perl-compatible regular expressions
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.SH SYNOPSIS
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.rs
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.sp
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.B #include <pcre.h>
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.PP
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.SM
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.B int pcre_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP,"
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.ti +5n
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.B "const char *\fIsubject\fP," int \fIlength\fP, int \fIstartoffset\fP,
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.ti +5n
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.B int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);
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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 matches a compiled regular expression against a given subject
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string, using a matching algorithm that is similar to Perl's. It returns
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offsets to captured substrings. Its arguments are:
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.sp
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\fIcode\fP Points to the compiled pattern
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\fIextra\fP Points to an associated \fBpcre_extra\fP structure,
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or is NULL
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\fIsubject\fP Points to the subject string
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\fIlength\fP Length of the subject string, in bytes
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\fIstartoffset\fP Offset in bytes in the subject at which to
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start matching
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\fIoptions\fP Option bits
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\fIovector\fP Points to a vector of ints for result offsets
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\fIovecsize\fP Number of elements in the vector (a multiple of 3)
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.sp
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The options are:
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.sp
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PCRE_ANCHORED Match only at the first position
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PCRE_BSR_ANYCRLF \eR matches only CR, LF, or CRLF
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PCRE_BSR_UNICODE \eR matches all Unicode line endings
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PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
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PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
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PCRE_NEWLINE_CR Recognize CR as the only newline sequence
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PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
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PCRE_NEWLINE_LF Recognize LF as the only newline sequence
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PCRE_NOTBOL Subject string is not the beginning of a line
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PCRE_NOTEOL Subject string is not the end of a line
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PCRE_NOTEMPTY An empty string is not a valid match
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PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
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is not a valid match
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PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
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PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
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validity (only relevant if PCRE_UTF8
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was set at compile time)
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PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
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PCRE_PARTIAL_SOFT ) match if no full matches are found
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PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
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even if there is a full match as well
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.sp
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For details of partial matching, see the
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.\" HREF
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\fBpcrepartial\fP
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.\"
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page. A \fBpcre_extra\fP structure contains the following fields:
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.sp
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\fIflags\fP Bits indicating which fields are set
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\fIstudy_data\fP Opaque data from \fBpcre_study()\fP
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\fImatch_limit\fP Limit on internal resource use
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\fImatch_limit_recursion\fP Limit on internal recursion depth
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\fIcallout_data\fP Opaque data passed back to callouts
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\fItables\fP Points to character tables or is NULL
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.sp
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The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
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PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
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PCRE_EXTRA_TABLES.
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.P
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There is a complete description of the PCRE native API in the
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.\" HREF
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\fBpcreapi\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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\fBpcreposix\fP
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.\"
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page.
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