pcre_dfa_exec man page
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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 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_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.htmlpcrematching 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 recursion
  
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_CALLOUT_DATA, and PCRE_EXTRA_TABLES. For DFA matching, the
match_limit field is not used, and must not be set.
There is a complete description of the PCRE native API in the
pcreapi.htmlpcreapi page and a description of the POSIX API in the
pcreposix.htmlpcreposix page.
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