1PCRE_DFA_EXEC(3)           Library Functions Manual           PCRE_DFA_EXEC(3)
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NAME

6       PCRE - Perl-compatible regular expressions
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SYNOPSIS

9
10       #include <pcre.h>
11
12       int pcre_dfa_exec(const pcre *code, const pcre_extra *extra,
13            const char *subject, int length, int startoffset,
14            int options, int *ovector, int ovecsize,
15            int *workspace, int wscount);
16
17       int pcre16_dfa_exec(const pcre16 *code, const pcre16_extra *extra,
18            PCRE_SPTR16 subject, int length, int startoffset,
19            int options, int *ovector, int ovecsize,
20            int *workspace, int wscount);
21
22       int pcre32_dfa_exec(const pcre32 *code, const pcre32_extra *extra,
23            PCRE_SPTR32 subject, int length, int startoffset,
24            int options, int *ovector, int ovecsize,
25            int *workspace, int wscount);
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DESCRIPTION

28
29       This  function  matches  a  compiled regular expression against a given
30       subject string, using an alternative matching algorithm that scans  the
31       subject  string  just  once  (not Perl-compatible). Note that the main,
32       Perl-compatible, matching function is pcre[16|32]_exec(). The arguments
33       for this function are:
34
35         code         Points to the compiled pattern
36         extra        Points to an associated pcre[16|32]_extra structure,
37                        or is NULL
38         subject      Points to the subject string
39         length       Length of the subject string
40         startoffset  Offset in the subject at which to start matching
41         options      Option bits
42         ovector      Points to a vector of ints for result offsets
43         ovecsize     Number of elements in the vector
44         workspace    Points to a vector of ints used as working space
45         wscount      Number of elements in the vector
46
47       The  units for length and startoffset are bytes for pcre_exec(), 16-bit
48       data items for pcre16_exec(), and 32-bit items for  pcre32_exec().  The
49       options are:
50
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_UTF16_CHECK    Do not check the subject for UTF-16
66                                  validity (only relevant if PCRE_UTF16
67                                  was set at compile time)
68         PCRE_NO_UTF32_CHECK    Do not check the subject for UTF-32
69                                  validity (only relevant if PCRE_UTF32
70                                  was set at compile time)
71         PCRE_NO_UTF8_CHECK     Do not check the subject for UTF-8
72                                  validity (only relevant if PCRE_UTF8
73                                  was set at compile time)
74         PCRE_PARTIAL           ) Return PCRE_ERROR_PARTIAL for a partial
75         PCRE_PARTIAL_SOFT      )   match if no full matches are found
76         PCRE_PARTIAL_HARD      Return PCRE_ERROR_PARTIAL for a partial match
77                                  even if there is a full match as well
78         PCRE_DFA_SHORTEST      Return only the shortest match
79         PCRE_DFA_RESTART       Restart after a partial match
80
81       There  are restrictions on what may appear in a pattern when using this
82       matching function. Details are given in the pcrematching documentation.
83       For details of partial matching, see the pcrepartial page.
84
85       A pcre[16|32]_extra structure contains the following fields:
86
87         flags            Bits indicating which fields are set
88         study_data       Opaque data from pcre[16|32]_study()
89         match_limit      Limit on internal resource use
90         match_limit_recursion  Limit on internal recursion depth
91         callout_data     Opaque data passed back to callouts
92         tables           Points to character tables or is NULL
93         mark             For passing back a *MARK pointer
94         executable_jit   Opaque data from JIT compilation
95
96       The   flag   bits  are  PCRE_EXTRA_STUDY_DATA,  PCRE_EXTRA_MATCH_LIMIT,
97       PCRE_EXTRA_MATCH_LIMIT_RECURSION,              PCRE_EXTRA_CALLOUT_DATA,
98       PCRE_EXTRA_TABLES,  PCRE_EXTRA_MARK  and PCRE_EXTRA_EXECUTABLE_JIT. For
99       this  matching  function,  the  match_limit  and  match_limit_recursion
100       fields are not used, and must not be set. The PCRE_EXTRA_EXECUTABLE_JIT
101       flag and the corresponding variable are ignored.
102
103       There is a complete description of the PCRE native API in  the  pcreapi
104       page and a description of the POSIX API in the pcreposix page.
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108PCRE 8.33                         12 May 2013                 PCRE_DFA_EXEC(3)
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