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<title>pcre2_dfa_match specification</title>
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<h1>pcre2_dfa_match man page</h1>
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<b>#include &#60;pcre2.h&#62;</b>
<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>
This function matches a compiled regular expression against a given subject
string, using an alternative matching algorithm that scans the subject string
just once (<i>not</i> Perl-compatible). (The Perl-compatible matching function
is <b>pcre2_match()</b>.) The arguments for this function are:
<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
For <b>pcre2_dfa_match()</b>, a match context is needed only if you want to set
up a callout function. The <i>length</i> and <i>startoffset</i> values are code
units, not characters. The options are:
PCRE2_ANCHORED Match only at the first position
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)
match if no full matches are found
PCRE2_PARTIAL_HARD Return PCRE2_ERROR_PARTIAL for a partial match
even if there is a full match as well
PCRE2_DFA_RESTART Restart after a partial match
PCRE2_DFA_SHORTEST Return only the shortest match
There are restrictions on what may appear in a pattern when using this matching
function. 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>
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