1PCRE2_DFA_MATCH(3) Library Functions Manual PCRE2_DFA_MATCH(3)
2
6 PCRE2 - Perl-compatible regular expressions (revised API)
7
9 #include <pcre2.h>
11 int pcre2_dfa_match(const pcre2_code *code, PCRE2_SPTR subject,
13 PCRE2_SIZE length, PCRE2_SIZE startoffset,
14 uint32_t options, pcre2_match_data *match_data,
15 pcre2_match_context *mcontext,
16 int *workspace, PCRE2_SIZE wscount);
17
19 This function matches a compiled regular expression against a given
21 subject string, using an alternative matching algorithm that scans the
22 subject string just once (not Perl-compatible). (The Perl-compatible
23 matching function is pcre2_match().) The arguments for this function
24 are:
25 code Points to the compiled pattern
27 subject Points to the subject string
28 length Length of the subject string
29 startoffset Offset in the subject at which to start matching
30 options Option bits
31 match_data Points to a match data block, for results
32 mcontext Points to a match context, or is NULL
33 workspace Points to a vector of ints used as working space
34 wscount Number of elements in the vector
35 For pcre2_dfa_match(), a match context is needed only if you want to
37 set up a callout function or specify the recursion limit. The length
38 and startoffset values are code units, not characters. The options are:
39 PCRE2_ANCHORED Match only at the first position
41 PCRE2_NOTBOL Subject is not the beginning of a line
42 PCRE2_NOTEOL Subject is not the end of a line
43 PCRE2_NOTEMPTY An empty string is not a valid match
44 PCRE2_NOTEMPTY_ATSTART An empty string at the start of the subject
45 is not a valid match
46 PCRE2_NO_UTF_CHECK Do not check the subject for UTF
47 validity (only relevant if PCRE2_UTF
48 was set at compile time)
49 PCRE2_PARTIAL_SOFT Return PCRE2_ERROR_PARTIAL for a partial
50 match if no full matches are found
51 PCRE2_PARTIAL_HARD Return PCRE2_ERROR_PARTIAL for a partial
52 match
53 even if there is a full match as well
54 PCRE2_DFA_RESTART Restart after a partial match
55 PCRE2_DFA_SHORTEST Return only the shortest match
56 There are restrictions on what may appear in a pattern when using this
58 matching function. Details are given in the pcre2matching documenta‐
59 tion. For details of partial matching, see the pcre2partial page. There
60 is a complete description of the PCRE2 native API in the pcre2api page
61 and a description of the POSIX API in the pcre2posix page.
62PCRE2 10.23 23 December 2016 PCRE2_DFA_MATCH(3)