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<html><head><title>pcre2_dfa_match specification</title></head><body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"><h1>pcre2_dfa_match man page</h1><p>Return to the <a href="index.html">PCRE2 index page</a>.</p><p>This page is part of the PCRE2 HTML documentation. It was generatedautomatically from the original man page. If there is any nonsense in it,please consult the man page, in case the conversion went wrong.<br><br><b>SYNOPSIS</b><br><P><b>#include <pcre2.h></b></P><P><b>int pcre2_dfa_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b><b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b><b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b><b> pcre2_match_context *<i>mcontext</i>,</b><b> int *<i>workspace</i>, PCRE2_SIZE <i>wscount</i>);</b></P><br><b>DESCRIPTION</b><br><P>This function matches a compiled regular expression against a given subjectstring, using an alternative matching algorithm that scans the subject stringjust once (except when processing lookaround assertions). This function is<i>not</i> Perl-compatible (the Perl-compatible matching function is<b>pcre2_match()</b>). The arguments for this function are:<pre> <i>code</i> Points to the compiled pattern <i>subject</i> Points to the subject string <i>length</i> Length of the subject string <i>startoffset</i> Offset in the subject at which to start matching <i>options</i> Option bits <i>match_data</i> Points to a match data block, for results <i>mcontext</i> Points to a match context, or is NULL <i>workspace</i> Points to a vector of ints used as working space <i>wscount</i> Number of elements in the vector</pre>The size of output vector needed to contain all the results depends on thenumber of simultaneous matches, not on the number of parentheses in thepattern. Using <b>pcre2_match_data_create_from_pattern()</b> to create the matchdata block is therefore not advisable when using this function.</P><P>A match context is needed only if you want to set up a callout function orspecify the heap limit or the match or the recursion depth limits. The<i>length</i> and <i>startoffset</i> values are code units, not characters. Theoptions 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 matchingfunction. Details are given in the<a href="pcre2matching.html"><b>pcre2matching</b></a>documentation. For details of partial matching, see the<a href="pcre2partial.html"><b>pcre2partial</b></a>page. There is a complete description of the PCRE2 native API in the<a href="pcre2api.html"><b>pcre2api</b></a>page and a description of the POSIX API in the<a href="pcre2posix.html"><b>pcre2posix</b></a>page.<p>Return to the <a href="index.html">PCRE2 index page</a>.</p>
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