2014-10-21 18:33:30 +02:00
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<title>pcre2_dfa_match specification</title>
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
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<h1>pcre2_dfa_match man page</h1>
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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<p>
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This page is part of the PCRE2 HTML documentation. It was generated
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automatically from the original man page. If there is any nonsense in it,
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please consult the man page, in case the conversion went wrong.
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<br>
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<br><b>
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SYNOPSIS
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</b><br>
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<P>
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<b>#include <pcre2.h></b>
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</P>
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<P>
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<b>int pcre2_dfa_match(const pcre2_code *<i>code</i>, PCRE2_SPTR <i>subject</i>,</b>
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<b> PCRE2_SIZE <i>length</i>, PCRE2_SIZE <i>startoffset</i>,</b>
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<b> uint32_t <i>options</i>, pcre2_match_data *<i>match_data</i>,</b>
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<b> pcre2_match_context *<i>mcontext</i>,</b>
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<b> int *<i>workspace</i>, PCRE2_SIZE <i>wscount</i>);</b>
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</P>
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<br><b>
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DESCRIPTION
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</b><br>
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<P>
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This function matches a compiled regular expression against a given subject
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string, using an alternative matching algorithm that scans the subject string
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2017-03-24 17:53:38 +01:00
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just once (except when processing lookaround assertions). This function is
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<i>not</i> Perl-compatible (the Perl-compatible matching function is
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<b>pcre2_match()</b>). The arguments for this function are:
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2014-10-21 18:33:30 +02:00
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<pre>
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<i>code</i> Points to the compiled pattern
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<i>subject</i> Points to the subject string
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<i>length</i> Length of the subject string
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<i>startoffset</i> Offset in the subject at which to start matching
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<i>options</i> Option bits
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<i>match_data</i> Points to a match data block, for results
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<i>mcontext</i> Points to a match context, or is NULL
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<i>workspace</i> Points to a vector of ints used as working space
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<i>wscount</i> Number of elements in the vector
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</pre>
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2021-08-31 18:14:42 +02:00
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The size of output vector needed to contain all the results depends on the
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number of simultaneous matches, not on the number of parentheses in the
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pattern. Using <b>pcre2_match_data_create_from_pattern()</b> to create the match
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data block is therefore not advisable when using this function.
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2021-08-28 17:25:59 +02:00
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</P>
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<P>
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A match context is needed only if you want to set up a callout function or
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specify the heap limit or the match or the recursion depth limits. The
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<i>length</i> and <i>startoffset</i> values are code units, not characters. The
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options are:
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2014-10-21 18:33:30 +02:00
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<pre>
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PCRE2_ANCHORED Match only at the first position
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2018-10-17 10:33:38 +02:00
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PCRE2_COPY_MATCHED_SUBJECT
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2019-03-04 19:07:04 +01:00
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On success, make a private subject copy
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2017-04-06 20:02:40 +02:00
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PCRE2_ENDANCHORED Pattern can match only at end of subject
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2014-10-21 18:33:30 +02:00
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PCRE2_NOTBOL Subject is not the beginning of a line
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PCRE2_NOTEOL Subject is not the end of a line
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PCRE2_NOTEMPTY An empty string is not a valid match
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2017-03-24 17:53:38 +01:00
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PCRE2_NOTEMPTY_ATSTART An empty string at the start of the subject is not a valid match
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PCRE2_NO_UTF_CHECK Do not check the subject for UTF validity (only relevant if PCRE2_UTF
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2014-10-21 18:33:30 +02:00
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was set at compile time)
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2017-03-24 17:53:38 +01:00
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PCRE2_PARTIAL_HARD Return PCRE2_ERROR_PARTIAL for a partial match even if there is a full match
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PCRE2_PARTIAL_SOFT Return PCRE2_ERROR_PARTIAL for a partial match if no full matches are found
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2014-10-21 18:33:30 +02:00
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PCRE2_DFA_RESTART Restart after a partial match
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PCRE2_DFA_SHORTEST Return only the shortest match
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</pre>
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There are restrictions on what may appear in a pattern when using this matching
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function. Details are given in the
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<a href="pcre2matching.html"><b>pcre2matching</b></a>
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documentation. For details of partial matching, see the
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<a href="pcre2partial.html"><b>pcre2partial</b></a>
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page. There is a complete description of the PCRE2 native API in the
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<a href="pcre2api.html"><b>pcre2api</b></a>
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page and a description of the POSIX API in the
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<a href="pcre2posix.html"><b>pcre2posix</b></a>
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page.
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<p>
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Return to the <a href="index.html">PCRE2 index page</a>.
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</p>
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