1PCRE_DFA_EXEC(3) Library Functions Manual PCRE_DFA_EXEC(3)
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6 PCRE - Perl-compatible regular expressions
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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);
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18 This function matches a compiled regular expression against a given
20 subject string, using an alternative matching algorithm that scans the
21 subject string just once (not Perl-compatible). Note that the main,
22 Perl-compatible, matching function is pcre_exec(). The arguments for
23 this function are:
24 code Points to the compiled pattern
26 extra Points to an associated pcre_extra structure,
27 or is NULL
28 subject Points to the subject string
29 length Length of the subject string, in bytes
30 startoffset Offset in bytes in the subject at which to
31 start matching
32 options Option bits
33 ovector Points to a vector of ints for result offsets
34 ovecsize Number of elements in the vector
35 workspace Points to a vector of ints used as working space
36 wscount Number of elements in the vector
37 The options are:
39 PCRE_ANCHORED Match only at the first position
41 PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF
42 PCRE_BSR_UNICODE \R matches all Unicode line endings
43 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
44 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
45 PCRE_NEWLINE_CR Recognize CR as the only newline sequence
46 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
47 PCRE_NEWLINE_LF Recognize LF as the only newline sequence
48 PCRE_NOTBOL Subject is not the beginning of a line
49 PCRE_NOTEOL Subject is not the end of a line
50 PCRE_NOTEMPTY An empty string is not a valid match
51 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
52 is not a valid match
53 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
54 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
55 validity (only relevant if PCRE_UTF8
56 was set at compile time)
57 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
58 PCRE_PARTIAL_SOFT ) match if no full matches are found
59 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
60 even if there is a full match as well
61 PCRE_DFA_SHORTEST Return only the shortest match
62 PCRE_DFA_RESTART Restart after a partial match
63 There are restrictions on what may appear in a pattern when using this
65 matching function. Details are given in the pcrematching documentation.
66 For details of partial matching, see the pcrepartial page.
67 A pcre_extra structure contains the following fields:
69 flags Bits indicating which fields are set
71 study_data Opaque data from pcre_study()
72 match_limit Limit on internal resource use
73 match_limit_recursion Limit on internal recursion depth
74 callout_data Opaque data passed back to callouts
75 tables Points to character tables or is NULL
76 The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
78 PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
79 PCRE_EXTRA_TABLES. For this matching function, the match_limit and
80 match_limit_recursion fields are not used, and must not be set.
81 There is a complete description of the PCRE native API in the pcreapi
83 page and a description of the POSIX API in the pcreposix page.
84 PCRE_DFA_EXEC(3)