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<title>pcre2_dfa_match specification</title>
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<h1>pcre2_dfa_match man page</h1>

Return to the <a href="index.html">PCRE2 index page</a>.


This page is part of the PCRE2 HTML documentation. It was generated
automatically from the original man page. If there is any nonsense in it,
please consult the man page, in case the conversion went wrong.
 
 
SYNOPSIS
 

#include &#60;pcre2.h&#62;


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);

 
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 (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:
<pre>
 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 matching
 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 space
 wscount Number of elements in the vector
</pre>
The size of output vector needed to contain all the results depends on the
number of simultaneous matches, not on the number of parentheses in the
pattern. Using pcre2_match_data_create_from_pattern() to create the match
data block is therefore not advisable when using this function.


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:
<pre>
 PCRE2_ANCHORED Match only at the first position
 PCRE2_COPY_MATCHED_SUBJECT
 On success, make a private subject copy
 PCRE2_ENDANCHORED Pattern can match only at end of subject
 PCRE2_NOTBOL Subject is not the beginning of a line
 PCRE2_NOTEOL Subject is not the end of a line
 PCRE2_NOTEMPTY An empty string is not a valid match
 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 PCRE2_UTF
 was set at compile time)
 PCRE2_PARTIAL_HARD Return PCRE2_ERROR_PARTIAL for a partial match even if there is a full match
 PCRE2_PARTIAL_SOFT Return PCRE2_ERROR_PARTIAL for a partial match if no full matches are found
 PCRE2_DFA_RESTART Restart after a partial match
 PCRE2_DFA_SHORTEST Return only the shortest match
</pre>
There are restrictions on what may appear in a pattern when using this matching
function. Details are given in the
<a href="pcre2matching.html">pcre2matching</a>
documentation. For details of partial matching, see the
<a href="pcre2partial.html">pcre2partial</a>
page. There is a complete description of the PCRE2 native API in the
<a href="pcre2api.html">pcre2api</a>
page and a description of the POSIX API in the
<a href="pcre2posix.html">pcre2posix</a>
page.

Return to the <a href="index.html">PCRE2 index page</a>.

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