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Contents of /code/trunk/doc/pcre_dfa_exec.3

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Load pcre-6.5 into code/trunk.

1 .TH PCRE_DFA_EXEC 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 .br
11 .B int pcre_dfa_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP,"
12 .ti +5n
13 .B "const char *\fIsubject\fP," int \fIlength\fP, int \fIstartoffset\fP,
14 .ti +5n
15 .B int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP,
16 .ti +5n
17 .B int *\fIworkspace\fP, int \fIwscount\fP);
18 .
19 .SH DESCRIPTION
20 .rs
21 .sp
22 This function matches a compiled regular expression against a given subject
23 string, using a DFA matching algorithm (\fInot\fP Perl-compatible). Note that
24 the main, Perl-compatible, matching function is \fBpcre_exec()\fP. The
25 arguments for this function are:
26 .sp
27 \fIcode\fP Points to the compiled pattern
28 \fIextra\fP Points to an associated \fBpcre_extra\fP structure,
29 or is NULL
30 \fIsubject\fP Points to the subject string
31 \fIlength\fP Length of the subject string, in bytes
32 \fIstartoffset\fP Offset in bytes in the subject at which to
33 start matching
34 \fIoptions\fP Option bits
35 \fIovector\fP Points to a vector of ints for result offsets
36 \fIovecsize\fP Number of elements in the vector
37 \fIworkspace\fP Points to a vector of ints used as working space
38 \fIwscount\fP Number of elements in the vector
39 .sp
40 The options are:
41 .sp
42 PCRE_ANCHORED Match only at the first position
43 PCRE_NOTBOL Subject is not the beginning of a line
44 PCRE_NOTEOL Subject is not the end of a line
45 PCRE_NOTEMPTY An empty string is not a valid match
46 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
47 validity (only relevant if PCRE_UTF8
48 was set at compile time)
49 PCRE_PARTIAL Return PCRE_ERROR_PARTIAL for a partial match
50 PCRE_DFA_SHORTEST Return only the shortest match
51 PCRE_DFA_RESTART This is a restart after a partial match
52 .sp
53 There are restrictions on what may appear in a pattern when matching using the
54 DFA algorithm is requested. Details are given in the
55 .\" HREF
56 \fBpcrematching\fP
57 .\"
58 documentation.
59 .P
60 A \fBpcre_extra\fP structure contains the following fields:
61 .sp
62 \fIflags\fP Bits indicating which fields are set
63 \fIstudy_data\fP Opaque data from \fBpcre_study()\fP
64 \fImatch_limit\fP Limit on internal resource use
65 \fImatch_limit_recursion\fP Limit on internal recursion depth
66 \fIcallout_data\fP Opaque data passed back to callouts
67 \fItables\fP Points to character tables or is NULL
68 .sp
69 The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
70 PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
71 PCRE_EXTRA_TABLES. For DFA matching, the \fImatch_limit\fP and
72 \fImatch_limit_recursion\fP fields are not used, and must not be set.
73 .P
74 There is a complete description of the PCRE native API in the
75 .\" HREF
76 \fBpcreapi\fP
77 .\"
78 page and a description of the POSIX API in the
79 .\" HREF
80 \fBpcreposix\fP
81 .\"
82 page.

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