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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_dfa_exec specification</title>
4 </head>
5 <body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
6 <h1>pcre_dfa_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_dfa_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 <b>int *<i>workspace</i>, int <i>wscount</i>);</b>
26 </P>
27 <br><b>
29 </b><br>
30 <P>
31 This function matches a compiled regular expression against a given subject
32 string, using an alternative matching algorithm that scans the subject string
33 just once (<i>not</i> Perl-compatible). Note that the main, Perl-compatible,
34 matching function is <b>pcre_exec()</b>. The arguments for this function are:
35 <pre>
36 <i>code</i> Points to the compiled pattern
37 <i>extra</i> Points to an associated <b>pcre_extra</b> structure,
38 or is NULL
39 <i>subject</i> Points to the subject string
40 <i>length</i> Length of the subject string, in bytes
41 <i>startoffset</i> Offset in bytes in the subject at which to
42 start matching
43 <i>options</i> Option bits
44 <i>ovector</i> Points to a vector of ints for result offsets
45 <i>ovecsize</i> Number of elements in the vector
46 <i>workspace</i> Points to a vector of ints used as working space
47 <i>wscount</i> Number of elements in the vector
48 </pre>
49 The options are:
50 <pre>
51 PCRE_ANCHORED Match only at the first position
52 PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF
53 PCRE_BSR_UNICODE \R matches all Unicode line endings
54 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
55 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
56 PCRE_NEWLINE_CR Recognize CR as the only newline sequence
57 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
58 PCRE_NEWLINE_LF Recognize LF as the only newline sequence
59 PCRE_NOTBOL Subject is not the beginning of a line
60 PCRE_NOTEOL Subject is not the end of a line
61 PCRE_NOTEMPTY An empty string is not a valid match
62 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
63 is not a valid match
64 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
65 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
66 validity (only relevant if PCRE_UTF8
67 was set at compile time)
68 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
69 PCRE_PARTIAL_SOFT ) match if no full matches are found
70 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
71 even if there is a full match as well
72 PCRE_DFA_SHORTEST Return only the shortest match
73 PCRE_DFA_RESTART Restart after a partial match
74 </pre>
75 There are restrictions on what may appear in a pattern when using this matching
76 function. Details are given in the
77 <a href="pcrematching.html"><b>pcrematching</b></a>
78 documentation. For details of partial matching, see the
79 <a href="pcrepartial.html"><b>pcrepartial</b></a>
80 page.
81 </P>
82 <P>
83 A <b>pcre_extra</b> structure contains the following fields:
84 <pre>
85 <i>flags</i> Bits indicating which fields are set
86 <i>study_data</i> Opaque data from <b>pcre_study()</b>
87 <i>match_limit</i> Limit on internal resource use
88 <i>match_limit_recursion</i> Limit on internal recursion depth
89 <i>callout_data</i> Opaque data passed back to callouts
90 <i>tables</i> Points to character tables or is NULL
91 </pre>
94 PCRE_EXTRA_TABLES. For this matching function, the <i>match_limit</i> and
95 <i>match_limit_recursion</i> fields are not used, and must not be set.
96 </P>
97 <P>
98 There is a complete description of the PCRE native API in the
99 <a href="pcreapi.html"><b>pcreapi</b></a>
100 page and a description of the POSIX API in the
101 <a href="pcreposix.html"><b>pcreposix</b></a>
102 page.
103 <p>
104 Return to the <a href="index.html">PCRE index page</a>.
105 </p>


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