/[pcre]/code/tags/pcre-7.2/doc/pcre_study.3
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Contents of /code/tags/pcre-7.2/doc/pcre_study.3

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Revision 186 - (show annotations)
Tue Jun 19 13:41:40 2007 UTC (13 years, 1 month ago) by ph10
File size: 1132 byte(s)
Created "tagged" 7.2 version.
1 .TH PCRE_STUDY 3
2 .SH NAME
3 PCRE - Perl-compatible regular expressions
4 .SH SYNOPSIS
5 .rs
6 .sp
7 .B #include <pcre.h>
8 .PP
9 .SM
10 .B pcre_extra *pcre_study(const pcre *\fIcode\fP, int \fIoptions\fP,
11 .ti +5n
12 .B const char **\fIerrptr\fP);
13 .
14 .SH DESCRIPTION
15 .rs
16 .sp
17 This function studies a compiled pattern, to see if additional information can
18 be extracted that might speed up matching. Its arguments are:
19 .sp
20 \fIcode\fP A compiled regular expression
21 \fIoptions\fP Options for \fBpcre_study()\fP
22 \fIerrptr\fP Where to put an error message
23 .sp
24 If the function succeeds, it returns a value that can be passed to
25 \fBpcre_exec()\fP via its \fIextra\fP argument.
26 .P
27 If the function returns NULL, either it could not find any additional
28 information, or there was an error. You can tell the difference by looking at
29 the error value. It is NULL in first case.
30 .P
31 There are currently no options defined; the value of the second argument should
32 always be zero.
33 .P
34 There is a complete description of the PCRE native API in the
35 .\" HREF
36 \fBpcreapi\fP
37 .\"
38 page and a description of the POSIX API in the
39 .\" HREF
40 \fBpcreposix\fP
41 .\"
42 page.

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