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pcre_dfa_exec man page
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int pcre_dfa_exec(const pcre *code, const pcre_extra *extra, const char *subject, int length, int startoffset, int options, int *ovector, int ovecsize, int *workspace, int wscount);
This function matches a compiled regular expression against a given subject string, using a DFA matching algorithm (not Perl-compatible). Note that the main, Perl-compatible, matching function is pcre_exec(). The arguments for this function are:
code Points to the compiled pattern extra Points to an associated pcre_extra structure, or is NULL subject Points to the subject string length Length of the subject string, in bytes startoffset Offset in bytes in the subject at which to start matching options Option bits ovector Points to a vector of ints for result offsets ovecsize Number of elements in the vector workspace Points to a vector of ints used as working space wscount Number of elements in the vector
The options are:
PCRE_ANCHORED Match only at the first position PCRE_NEWLINE_CR Set CR as the newline sequence PCRE_NEWLINE_CRLF Set CRLF as the newline sequence PCRE_NEWLINE_LF Set LF as the newline sequence PCRE_NOTBOL Subject is not the beginning of a line PCRE_NOTEOL Subject is not the end of a line PCRE_NOTEMPTY An empty string is not a valid match PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8 validity (only relevant if PCRE_UTF8 was set at compile time) PCRE_PARTIAL Return PCRE_ERROR_PARTIAL for a partial match PCRE_DFA_SHORTEST Return only the shortest match PCRE_DFA_RESTART This is a restart after a partial match
There are restrictions on what may appear in a pattern when matching using the DFA algorithm is requested. Details are given in the pcrematching documentation.
A pcre_extra structure contains the following fields:
flags Bits indicating which fields are set study_data Opaque data from pcre_study() match_limit Limit on internal resource use match_limit_recursion Limit on internal recursion depth callout_data Opaque data passed back to callouts tables Points to character tables or is NULL
The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT, PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and PCRE_EXTRA_TABLES. For DFA matching, the match_limit and match_limit_recursion fields are not used, and must not be set.