/[pcre]/code/trunk/doc/pcre_exec.3
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revision 63 by nigel, Sat Feb 24 21:40:03 2007 UTC revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC
# Line 1  Line 1 
1  .TH PCRE 3  .TH PCRE_EXEC 3
2  .SH NAME  .SH NAME
3  PCRE - Perl-compatible regular expressions  PCRE - Perl-compatible regular expressions
4  .SH SYNOPSIS  .SH SYNOPSIS
# Line 8  PCRE - Perl-compatible regular expressio Line 8  PCRE - Perl-compatible regular expressio
8  .PP  .PP
9  .SM  .SM
10  .br  .br
11  .B int pcre_exec(const pcre *\fIcode\fR, "const pcre_extra *\fIextra\fR,"  .B int pcre_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP,"
12  .ti +5n  .ti +5n
13  .B "const char *\fIsubject\fR," int \fIlength\fR, int \fIstartoffset\fR,  .B "const char *\fIsubject\fP," int \fIlength\fP, int \fIstartoffset\fP,
14  .ti +5n  .ti +5n
15  .B int \fIoptions\fR, int *\fIovector\fR, int \fIovecsize\fR);  .B int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);
16    .
17  .SH DESCRIPTION  .SH DESCRIPTION
18  .rs  .rs
19  .sp  .sp
20  This function matches a compiled regular expression against a given subject  This function matches a compiled regular expression against a given subject
21  string, and returns offsets to capturing subexpressions. Its arguments are:  string, using a matching algorithm that is similar to Perl's. It returns
22    offsets to captured substrings. Its arguments are:
23    \fIcode\fR         Points to the compiled pattern  .sp
24    \fIextra\fR        Points to an associated \fBpcre_extra\fR structure,    \fIcode\fP         Points to the compiled pattern
25      \fIextra\fP        Points to an associated \fBpcre_extra\fP structure,
26                   or is NULL                   or is NULL
27    \fIsubject\fR      Points to the subject string    \fIsubject\fP      Points to the subject string
28    \fIlength\fR       Length of the subject string, in bytes    \fIlength\fP       Length of the subject string, in bytes
29    \fIstartoffset\fR  Offset in bytes in the subject at which to    \fIstartoffset\fP  Offset in bytes in the subject at which to
30                   start matching                   start matching
31    \fIoptions\fR      Option bits    \fIoptions\fP      Option bits
32    \fIovector\fR      Points to a vector of ints for result offsets    \fIovector\fP      Points to a vector of ints for result offsets
33    \fIovecsize\fR     Size of the vector (a multiple of 3)    \fIovecsize\fP     Number of elements in the vector (a multiple of 3)
34    .sp
35  The options are:  The options are:
36    .sp
37    PCRE_ANCHORED      Match only at the first position    PCRE_ANCHORED      Match only at the first position
38      PCRE_NEWLINE_ANY   Recognize any Unicode newline sequence
39      PCRE_NEWLINE_CR    Set CR as the newline sequence
40      PCRE_NEWLINE_CRLF  Set CRLF as the newline sequence
41      PCRE_NEWLINE_LF    Set LF as the newline sequence
42    PCRE_NOTBOL        Subject is not the beginning of a line    PCRE_NOTBOL        Subject is not the beginning of a line
43    PCRE_NOTEOL        Subject is not the end of a line    PCRE_NOTEOL        Subject is not the end of a line
44    PCRE_NOTEMPTY      An empty string is not a valid match    PCRE_NOTEMPTY      An empty string is not a valid match
45      PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
46  There is a complete description of the PCRE API in the                         validity (only relevant if PCRE_UTF8
47                           was set at compile time)
48      PCRE_PARTIAL       Return PCRE_ERROR_PARTIAL for a partial match
49    .sp
50    There are restrictions on what may appear in a pattern when partial matching is
51    requested. For details, see the
52    .\" HREF
53    \fBpcrepartial\fP
54    .\"
55    page.
56    .P
57    A \fBpcre_extra\fP structure contains the following fields:
58    .sp
59      \fIflags\fP        Bits indicating which fields are set
60      \fIstudy_data\fP   Opaque data from \fBpcre_study()\fP
61      \fImatch_limit\fP  Limit on internal resource use
62      \fImatch_limit_recursion\fP  Limit on internal recursion depth
63      \fIcallout_data\fP Opaque data passed back to callouts
64      \fItables\fP       Points to character tables or is NULL
65    .sp
66    The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
67    PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
68    PCRE_EXTRA_TABLES.
69    .P
70    There is a complete description of the PCRE native API in the
71    .\" HREF
72    \fBpcreapi\fP
73    .\"
74    page and a description of the POSIX API in the
75  .\" HREF  .\" HREF
76  \fBpcreapi\fR  \fBpcreposix\fP
77  .\"  .\"
78  page.  page.

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