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, in bytes
40 startoffset Offset in bytes in the subject at which to
41 start matching
42 options Option bits
43 ovector Points to a vector of ints for result offsets
44 ovecsize Number of elements in the vector
45 workspace Points to a vector of ints used as working space
46 wscount Number of elements in the vector
47 The options are:
49 PCRE_ANCHORED Match only at the first position
51 PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF
52 PCRE_BSR_UNICODE \R matches all Unicode line endings
53 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
54 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
55 PCRE_NEWLINE_CR Recognize CR as the only newline sequence
56 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
57 PCRE_NEWLINE_LF Recognize LF as the only newline sequence
58 PCRE_NOTBOL Subject is not the beginning of a line
59 PCRE_NOTEOL Subject is not the end of a line
60 PCRE_NOTEMPTY An empty string is not a valid match
61 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
62 is not a valid match
63 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
64 PCRE_NO_UTF16_CHECK Do not check the subject for UTF-16
65 validity (only relevant if PCRE_UTF16
66 was set at compile time)
67 PCRE_NO_UTF32_CHECK Do not check the subject for UTF-32
68 validity (only relevant if PCRE_UTF32
69 was set at compile time)
70 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
71 validity (only relevant if PCRE_UTF8
72 was set at compile time)
73 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
74 PCRE_PARTIAL_SOFT ) match if no full matches are found
75 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
76 even if there is a full match as well
77 PCRE_DFA_SHORTEST Return only the shortest match
78 PCRE_DFA_RESTART Restart after a partial match
79 There are restrictions on what may appear in a pattern when using this
81 matching function. Details are given in the pcrematching documentation.
82 For details of partial matching, see the pcrepartial page.
83 A pcre[16|32]_extra structure contains the following fields:
85 flags Bits indicating which fields are set
87 study_data Opaque data from pcre[16|32]_study()
88 match_limit Limit on internal resource use
89 match_limit_recursion Limit on internal recursion depth
90 callout_data Opaque data passed back to callouts
91 tables Points to character tables or is NULL
92 mark For passing back a *MARK pointer
93 executable_jit Opaque data from JIT compilation
94 The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
96 PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA,
97 PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT. For
98 this matching function, the match_limit and match_limit_recursion
99 fields are not used, and must not be set. The PCRE_EXTRA_EXECUTABLE_JIT
100 flag and the corresponding variable are ignored.
101 There is a complete description of the PCRE native API in the pcreapi
103 page and a description of the POSIX API in the pcreposix page.
104PCRE 8.30 24 June 2012 PCRE_DFA_EXEC(3)