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pcre_dfa_exec.html

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

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


This page is part of the PCRE 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;pcre.h&#62;


int pcre_dfa_exec(const pcre *code, const pcre_extra *extra,
const char *subject, int length, int startoffset,
int options, int *ovector, int ovecsize,
int *workspace, int 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 (not Perl-compatible). Note that the main, Perl-compatible,
matching function is pcre_exec(). The arguments for this function are:
<pre>
 code Points to the compiled pattern
 extra Points to an associated pcre_extra structure,
 or is NULL
 subject Points to the subject string
 length Length of the subject string, in bytes
 startoffset Offset in bytes in the subject at which to
 start matching
 options Option bits
 ovector Points to a vector of ints for result offsets
 ovecsize Number of elements in the vector
 workspace Points to a vector of ints used as working space
 wscount Number of elements in the vector
</pre>
The options are:
<pre>
 PCRE_ANCHORED Match only at the first position
 PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF
 PCRE_BSR_UNICODE \R matches all Unicode line endings
 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence
 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences
 PCRE_NEWLINE_CR Recognize CR as the only newline sequence
 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence
 PCRE_NEWLINE_LF Recognize LF as the only newline sequence
 PCRE_NOTBOL Subject is not the beginning of a line
 PCRE_NOTEOL Subject is not the end of a line
 PCRE_NOTEMPTY An empty string is not a valid match
 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject
 is not a valid match
 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations
 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8
 validity (only relevant if PCRE_UTF8
 was set at compile time)
 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial
 PCRE_PARTIAL_SOFT ) match if no full matches are found
 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match
 even if there is a full match as well
 PCRE_DFA_SHORTEST Return only the shortest match
 PCRE_DFA_RESTART Restart after a partial match
</pre>
There are restrictions on what may appear in a pattern when using this matching
function. Details are given in the
<a href="pcrematching.html">pcrematching</a>
documentation. For details of partial matching, see the
<a href="pcrepartial.html">pcrepartial</a>
page.


A pcre_extra structure contains the following fields:
<pre>
 flags Bits indicating which fields are set
 study_data Opaque data from pcre_study()
 match_limit Limit on internal resource use
 match_limit_recursion Limit on internal recursion depth
 callout_data Opaque data passed back to callouts
 tables Points to character tables or is NULL
</pre>
The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT,
PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and
PCRE_EXTRA_TABLES. For this matching function, the match_limit and
match_limit_recursion fields are not used, and must not be set.


There is a complete description of the PCRE native API in the
<a href="pcreapi.html">pcreapi</a>
page and a description of the POSIX API in the
<a href="pcreposix.html">pcreposix</a>
page.

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

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