PCRE2_DFA_MATCH(3)      (16 October 2018)      PCRE2_DFA_MATCH(3)

          PCRE2 - Perl-compatible regular expressions (revised API)


          #include <pcre2.h>

          int pcre2_dfa_match(const pcre2_code *code, PCRE2_SPTR subject,
            PCRE2_SIZE length, PCRE2_SIZE startoffset,
            uint32_t options, pcre2_match_data *match_data,
            pcre2_match_context *mcontext,
            int *workspace, PCRE2_SIZE wscount);


          This function matches a compiled regular expression against
          a given subject string, using an alternative matching algo-
          rithm that scans the subject string just once (except when
          processing lookaround assertions). This function is not
          Perl-compatible (the Perl-compatible matching function is
          pcre2_match()). The arguments for this function are:

            code         Points to the compiled pattern
            subject      Points to the subject string
            length       Length of the subject string
            startoffset  Offset in the subject at which to start
            options      Option bits
            match_data   Points to a match data block, for results
            mcontext     Points to a match context, or is NULL
            workspace    Points to a vector of ints used as working
            wscount      Number of elements in the vector

          For pcre2_dfa_match(), a match context is needed only if you
          want to set up a callout function or specify the heap limit
          or the match or the recursion depth limits. The length and
          startoffset values are code units, not characters. The
          options are:

            PCRE2_ANCHORED          Match only at the first position
                                    On success, make a private subject
            PCRE2_ENDANCHORED       Pattern can match only at end of
            PCRE2_NOTBOL            Subject is not the beginning of a
            PCRE2_NOTEOL            Subject is not the end of a line
            PCRE2_NOTEMPTY          An empty string is not a valid

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     PCRE2_DFA_MATCH(3)      (16 October 2018)      PCRE2_DFA_MATCH(3)

            PCRE2_NOTEMPTY_ATSTART  An empty string at the start of
          the subject
                                     is not a valid match
            PCRE2_NO_UTF_CHECK      Do not check the subject for UTF
                                     validity (only relevant if
                                     was set at compile time)
            PCRE2_PARTIAL_HARD      Return PCRE2_ERROR_PARTIAL for a
                                     match even if there is a full
            PCRE2_PARTIAL_SOFT      Return PCRE2_ERROR_PARTIAL for a
                                     match if no full matches are
            PCRE2_DFA_RESTART       Restart after a partial match
            PCRE2_DFA_SHORTEST      Return only the shortest match

          There are restrictions on what may appear in a pattern when
          using this matching function. Details are given in the
          pcre2matching documentation. For details of partial match-
          ing, see the pcre2partial page. There is a complete descrip-
          tion of the PCRE2 native API in the pcre2api page and a
          description of the POSIX API in the pcre2posix page.

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