.TH PCRE_EXEC 3 .SH NAME PCRE - Perl-compatible regular expressions .SH SYNOPSIS .rs .sp .B #include <pcre.h> .PP .SM .B int pcre_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP," .ti +5n .B "const char *\fIsubject\fP," int \fIlength\fP, int \fIstartoffset\fP, .ti +5n .B int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP); . .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_extra\fP structure, or is NULL \fIsubject\fP Points to the subject string \fIlength\fP Length of the subject string, in bytes \fIstartoffset\fP Offset in bytes 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 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, and CRLF as newline sequences PCRE_NEWLINE_CR Set CR as the newline sequence PCRE_NEWLINE_CRLF Set CRLF as the newline sequence PCRE_NEWLINE_LF Set LF as the newline sequence PCRE_NOTBOL Subject is not the beginning of a line PCRE_NOTEOL Subject is not the end of a line PCRE_NOTEMPTY An empty string is not a valid match PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations 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 match .sp There are restrictions on what may appear in a pattern when partial matching is requested. For details, see the .\" HREF \fBpcrepartial\fP .\" page. .P 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_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 .sp The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT, PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and PCRE_EXTRA_TABLES. .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.