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1 <html>
2 <head>
3 <title>pcre_exec specification</title>
4 </head>
5 <body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
6 <h1>pcre_exec man page</h1>
7 <p>
8 Return to the <a href="index.html">PCRE index page</a>.
9 </p>
10 <p>
11 This page is part of the PCRE HTML documentation. It was generated automatically
12 from the original man page. If there is any nonsense in it, please consult the
13 man page, in case the conversion went wrong.
14 <br>
15 <br><b>
16 SYNOPSIS
17 </b><br>
18 <P>
19 <b>#include &#60;pcre.h&#62;</b>
20 </P>
21 <P>
22 <b>int pcre_exec(const pcre *<i>code</i>, const pcre_extra *<i>extra</i>,</b>
23 <b>const char *<i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b>
24 <b>int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>);</b>
25 </P>
26 <br><b>
27 DESCRIPTION
28 </b><br>
29 <P>
30 This function matches a compiled regular expression against a given subject
31 string, using a matching algorithm that is similar to Perl's. It returns
32 offsets to captured substrings. Its arguments are:
33 <pre>
34 <i>code</i> Points to the compiled pattern
35 <i>extra</i> Points to an associated <b>pcre_extra</b> structure,
36 or is NULL
37 <i>subject</i> Points to the subject string
38 <i>length</i> Length of the subject string, in bytes
39 <i>startoffset</i> Offset in bytes in the subject at which to
40 start matching
41 <i>options</i> Option bits
42 <i>ovector</i> Points to a vector of ints for result offsets
43 <i>ovecsize</i> Number of elements in the vector (a multiple of 3)
44 </pre>
45 The options are:
46 <pre>
47 PCRE_ANCHORED Match only at the first position
48 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
49 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, and CRLF as newline sequences
50 PCRE_NEWLINE_CR Set CR as the newline sequence
51 PCRE_NEWLINE_CRLF Set CRLF as the newline sequence
52 PCRE_NEWLINE_LF Set LF as the newline sequence
53 PCRE_NOTBOL Subject is not the beginning of a line
54 PCRE_NOTEOL Subject is not the end of a line
55 PCRE_NOTEMPTY An empty string is not a valid match
56 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
57 validity (only relevant if PCRE_UTF8
58 was set at compile time)
59 PCRE_PARTIAL Return PCRE_ERROR_PARTIAL for a partial match
60 </pre>
61 There are restrictions on what may appear in a pattern when partial matching is
62 requested. For details, see the
63 <a href="pcrepartial.html"><b>pcrepartial</b></a>
64 page.
65 </P>
66 <P>
67 A <b>pcre_extra</b> structure contains the following fields:
68 <pre>
69 <i>flags</i> Bits indicating which fields are set
70 <i>study_data</i> Opaque data from <b>pcre_study()</b>
71 <i>match_limit</i> Limit on internal resource use
72 <i>match_limit_recursion</i> Limit on internal recursion depth
73 <i>callout_data</i> Opaque data passed back to callouts
74 <i>tables</i> Points to character tables or is NULL
75 </pre>
76 The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
77 PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
78 PCRE_EXTRA_TABLES.
79 </P>
80 <P>
81 There is a complete description of the PCRE native API in the
82 <a href="pcreapi.html"><b>pcreapi</b></a>
83 page and a description of the POSIX API in the
84 <a href="pcreposix.html"><b>pcreposix</b></a>
85 page.
86 <p>
87 Return to the <a href="index.html">PCRE index page</a>.
88 </p>

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