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Add more explanation about recursive subpatterns, and make it possible to 
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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>
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>
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_BSR_ANYCRLF \R matches only CR, LF, or CRLF
49 PCRE_BSR_UNICODE \R matches all Unicode line endings
50 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
51 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
52 PCRE_NEWLINE_CR Recognize CR as the only newline sequence
53 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
54 PCRE_NEWLINE_LF Recognize LF as the only newline sequence
55 PCRE_NOTBOL Subject string is not the beginning of a line
56 PCRE_NOTEOL Subject string is not the end of a line
57 PCRE_NOTEMPTY An empty string is not a valid match
58 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
59 is not a valid match
60 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
61 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
62 validity (only relevant if PCRE_UTF8
63 was set at compile time)
64 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
65 PCRE_PARTIAL_SOFT ) match if no full matches are found
66 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
67 even if there is a full match as well
68 </pre>
69 For details of partial matching, see the
70 <a href="pcrepartial.html"><b>pcrepartial</b></a>
71 page. A <b>pcre_extra</b> structure contains the following fields:
72 <pre>
73 <i>flags</i> Bits indicating which fields are set
74 <i>study_data</i> Opaque data from <b>pcre_study()</b>
75 <i>match_limit</i> Limit on internal resource use
76 <i>match_limit_recursion</i> Limit on internal recursion depth
77 <i>callout_data</i> Opaque data passed back to callouts
78 <i>tables</i> Points to character tables or is NULL
79 </pre>
83 </P>
84 <P>
85 There is a complete description of the PCRE native API in the
86 <a href="pcreapi.html"><b>pcreapi</b></a>
87 page and a description of the POSIX API in the
88 <a href="pcreposix.html"><b>pcreposix</b></a>
89 page.
90 <p>
91 Return to the <a href="index.html">PCRE index page</a>.
92 </p>


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