1PCRE_DFA_EXEC(3) Library Functions Manual PCRE_DFA_EXEC(3)
2
6 PCRE - Perl-compatible regular expressions
7
9 #include <pcre.h>
11 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 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 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);
26
28 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 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 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 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 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 A pcre[16|32]_extra structure contains the following fields:
86 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 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 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.
105PCRE 8.33 12 May 2013 PCRE_DFA_EXEC(3)