1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
.TH PCRE_DFA_EXEC 3 "12 May 2013" "PCRE 8.33"
.SH NAME
PCRE - Perl-compatible regular expressions
.SH SYNOPSIS
.rs
.sp
.B #include <pcre.h>
.PP
.nf
.B int pcre_dfa_exec(const pcre *\fIcode\fP, "const pcre_extra *\fIextra\fP,"
.B " const char *\fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP,"
.B " int *\fIworkspace\fP, int \fIwscount\fP);"
.sp
.B int pcre16_dfa_exec(const pcre16 *\fIcode\fP, "const pcre16_extra *\fIextra\fP,"
.B " PCRE_SPTR16 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP,"
.B " int *\fIworkspace\fP, int \fIwscount\fP);"
.sp
.B int pcre32_dfa_exec(const pcre32 *\fIcode\fP, "const pcre32_extra *\fIextra\fP,"
.B " PCRE_SPTR32 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
.B " int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP,"
.B " int *\fIworkspace\fP, int \fIwscount\fP);"
.fi
.
.SH DESCRIPTION
.rs
.sp
This function matches a compiled regular expression against a given subject
string, using an alternative matching algorithm that scans the subject string
just once (\fInot\fP Perl-compatible). Note that the main, Perl-compatible,
matching function is \fBpcre[16|32]_exec()\fP. The arguments for this function
are:
.sp
\fIcode\fP Points to the compiled pattern
\fIextra\fP Points to an associated \fBpcre[16|32]_extra\fP structure,
or is NULL
\fIsubject\fP Points to the subject string
\fIlength\fP Length of the subject string
\fIstartoffset\fP Offset in the subject at which to start matching
\fIoptions\fP Option bits
\fIovector\fP Points to a vector of ints for result offsets
\fIovecsize\fP Number of elements in the vector
\fIworkspace\fP Points to a vector of ints used as working space
\fIwscount\fP Number of elements in the vector
.sp
The units for \fIlength\fP and \fIstartoffset\fP are bytes for
\fBpcre_exec()\fP, 16-bit data items for \fBpcre16_exec()\fP, and 32-bit items
for \fBpcre32_exec()\fP. The options are:
.sp
PCRE_ANCHORED Match only at the first position
PCRE_BSR_ANYCRLF \eR matches only CR, LF, or CRLF
PCRE_BSR_UNICODE \eR matches all Unicode line endings
PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
PCRE_NEWLINE_CR Recognize CR as the only newline sequence
PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
PCRE_NEWLINE_LF Recognize LF as the only newline sequence
PCRE_NOTBOL Subject is not the beginning of a line
PCRE_NOTEOL Subject is not the end of a line
PCRE_NOTEMPTY An empty string is not a valid match
PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
is not a valid match
PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
PCRE_NO_UTF16_CHECK Do not check the subject for UTF-16
validity (only relevant if PCRE_UTF16
was set at compile time)
PCRE_NO_UTF32_CHECK Do not check the subject for UTF-32
validity (only relevant if PCRE_UTF32
was set at compile time)
PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
validity (only relevant if PCRE_UTF8
was set at compile time)
PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
PCRE_PARTIAL_SOFT ) match if no full matches are found
PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
even if there is a full match as well
PCRE_DFA_SHORTEST Return only the shortest match
PCRE_DFA_RESTART Restart after a partial match
.sp
There are restrictions on what may appear in a pattern when using this matching
function. Details are given in the
.\" HREF
\fBpcrematching\fP
.\"
documentation. For details of partial matching, see the
.\" HREF
\fBpcrepartial\fP
.\"
page.
.P
A \fBpcre[16|32]_extra\fP structure contains the following fields:
.sp
\fIflags\fP Bits indicating which fields are set
\fIstudy_data\fP Opaque data from \fBpcre[16|32]_study()\fP
\fImatch_limit\fP Limit on internal resource use
\fImatch_limit_recursion\fP Limit on internal recursion depth
\fIcallout_data\fP Opaque data passed back to callouts
\fItables\fP Points to character tables or is NULL
\fImark\fP For passing back a *MARK pointer
\fIexecutable_jit\fP Opaque data from JIT compilation
.sp
The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA,
PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT. For this
matching function, the \fImatch_limit\fP and \fImatch_limit_recursion\fP fields
are not used, and must not be set. The PCRE_EXTRA_EXECUTABLE_JIT flag and
the corresponding variable are ignored.
.P
There is a complete description of the PCRE native API in the
.\" HREF
\fBpcreapi\fP
.\"
page and a description of the POSIX API in the
.\" HREF
\fBpcreposix\fP
.\"
page.
|
