/usr/man/cat.3/pcre_dfa_exec.3.Z(/usr/man/cat.3/pcre_dfa_exec.3.Z)

NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS

       #include <pcre.h>

       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);

DESCRIPTION

       This  function  matches  a  compiled regular expression against a given
       subject string, using an alternative matching algorithm that scans  the
       subject  string  just  once  (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_ANY   Recognize any Unicode newline sequence
         PCRE_NEWLINE_ANYCRLF  Recognize CR, LF, and CRLF as newline sequences
         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 using  this
       matching function. 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 this  matching  function,  the  match_limit  and
       match_limit_recursion fields are not used, and must not be set.

       There  is  a complete description of the PCRE native API in the pcreapi
       page and a description of the POSIX API in the pcreposix page.

                                                              PCRE_DFA_EXEC(3)