113 lines
6.2 KiB
HTML
113 lines
6.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of PCRE2_DFA_MATCH</TITLE>
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</HEAD><BODY>
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<H1>PCRE2_DFA_MATCH</H1>
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Section: C Library Functions (3)<BR>Updated: 16 October 2018<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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PCRE2 - Perl-compatible regular expressions (revised API)
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<P>
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<B>#include <<A HREF="file:///usr/include/pcre2.h">pcre2.h</A>></B>
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<P>
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<PRE>
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<B>int pcre2_dfa_match(const pcre2_code *</B><I>code</I>, PCRE2_SPTR <I>subject</I>,
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<B> PCRE2_SIZE </B><I>length</I>, PCRE2_SIZE <I>startoffset</I>,
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<B> uint32_t </B><I>options</I>, pcre2_match_data *<I>match_data</I>,
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<B> pcre2_match_context *</B><I>mcontext</I>,
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<B> int *</B><I>workspace</I>, PCRE2_SIZE <I>wscount</I>);
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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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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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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<P>
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<BR> <I>code</I> Points to the compiled pattern
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<BR> <I>subject</I> Points to the subject string
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<BR> <I>length</I> Length of the subject string
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<BR> <I>startoffset</I> Offset in the subject at which to start matching
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<BR> <I>options</I> Option bits
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<BR> <I>match_data</I> Points to a match data block, for results
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<BR> <I>mcontext</I> Points to a match context, or is NULL
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<BR> <I>workspace</I> Points to a vector of ints used as working space
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<BR> <I>wscount</I> Number of elements in the vector
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<P>
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For <B>pcre2_dfa_match()</B>, a match context is needed only if you want to set
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up a callout function or specify the heap limit or the match or the recursion
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depth limits. The <I>length</I> and <I>startoffset</I> values are code units, not
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characters. The options are:
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<P>
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<BR> PCRE2_ANCHORED Match only at the first position
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<BR> PCRE2_COPY_MATCHED_SUBJECT
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<BR> On success, make a private subject copy
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<BR> PCRE2_ENDANCHORED Pattern can match only at end of subject
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<BR> PCRE2_NOTBOL Subject is not the beginning of a line
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<BR> PCRE2_NOTEOL Subject is not the end of a line
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<BR> PCRE2_NOTEMPTY An empty string is not a valid match
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<BR> PCRE2_NOTEMPTY_ATSTART An empty string at the start of the subject
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<BR> is not a valid match
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<BR> PCRE2_NO_UTF_CHECK Do not check the subject for UTF
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<BR> validity (only relevant if PCRE2_UTF
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<BR> was set at compile time)
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<BR> PCRE2_PARTIAL_HARD Return PCRE2_ERROR_PARTIAL for a partial
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<BR> match even if there is a full match
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<BR> PCRE2_PARTIAL_SOFT Return PCRE2_ERROR_PARTIAL for a partial
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<BR> match if no full matches are found
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<BR> PCRE2_DFA_RESTART Restart after a partial match
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<BR> PCRE2_DFA_SHORTEST Return only the shortest match
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<P>
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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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<B>pcre2matching</B>
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documentation. For details of partial matching, see the
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<B>pcre2partial</B>
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page. There is a complete description of the PCRE2 native API in the
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<B>pcre2api</B>
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page and a description of the POSIX API in the
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<B>pcre2posix</B>
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page.
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:50 GMT, March 31, 2021
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</BODY>
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</HTML>
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