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<title>pcre_dfa_exec specification</title> |
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<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"> |
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<h1>pcre_dfa_exec man page</h1> |
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Return to the <a href="index.html">PCRE index page</a>. |
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</p> |
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<p> |
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This page is part of the PCRE HTML documentation. It was generated automatically |
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from the original man page. If there is any nonsense in it, please consult the |
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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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<b>#include <pcre.h></b> |
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</P> |
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<P> |
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<b>int pcre_dfa_exec(const pcre *<i>code</i>, const pcre_extra *<i>extra</i>,</b> |
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<b>const char *<i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b> |
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<b>int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>,</b> |
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<b>int *<i>workspace</i>, int <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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just once (<i>not</i> Perl-compatible). Note that the main, Perl-compatible, |
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matching function is <b>pcre_exec()</b>. The arguments for this function are: |
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<pre> |
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<i>code</i> Points to the compiled pattern |
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<i>extra</i> Points to an associated <b>pcre_extra</b> structure, |
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or is NULL |
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<i>subject</i> Points to the subject string |
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<i>length</i> Length of the subject string, in bytes |
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<i>startoffset</i> Offset in bytes in the subject at which to |
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start matching |
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<i>options</i> Option bits |
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<i>ovector</i> Points to a vector of ints for result offsets |
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<i>ovecsize</i> Number of elements in the vector |
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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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The options are: |
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<pre> |
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PCRE_ANCHORED Match only at the first position |
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PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF |
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PCRE_BSR_UNICODE \R matches all Unicode line endings |
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PCRE_NEWLINE_ANY Recognize any Unicode newline sequence |
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PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences |
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PCRE_NEWLINE_CR Recognize CR as the only newline sequence |
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PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence |
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PCRE_NEWLINE_LF Recognize LF as the only newline sequence |
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PCRE_NOTBOL Subject is not the beginning of a line |
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PCRE_NOTEOL Subject is not the end of a line |
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PCRE_NOTEMPTY An empty string is not a valid match |
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PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject |
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is not a valid match |
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PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations |
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PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8 |
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validity (only relevant if PCRE_UTF8 |
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was set at compile time) |
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PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial |
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PCRE_PARTIAL_SOFT ) match if no full matches are found |
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PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match |
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even if there is a full match as well |
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PCRE_DFA_SHORTEST Return only the shortest match |
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PCRE_DFA_RESTART Restart after a partial 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="pcrematching.html"><b>pcrematching</b></a> |
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documentation. For details of partial matching, see the |
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<a href="pcrepartial.html"><b>pcrepartial</b></a> |
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page. |
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</P> |
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<P> |
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A <b>pcre_extra</b> structure contains the following fields: |
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<pre> |
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<i>flags</i> Bits indicating which fields are set |
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<i>study_data</i> Opaque data from <b>pcre_study()</b> |
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<i>match_limit</i> Limit on internal resource use |
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<i>match_limit_recursion</i> Limit on internal recursion depth |
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<i>callout_data</i> Opaque data passed back to callouts |
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<i>tables</i> Points to character tables or is NULL |
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</pre> |
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The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT, |
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PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, and |
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PCRE_EXTRA_TABLES. For this matching function, the <i>match_limit</i> and |
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<i>match_limit_recursion</i> fields are not used, and must not be set. |
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</P> |
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<P> |
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There is a complete description of the PCRE native API in the |
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<a href="pcreapi.html"><b>pcreapi</b></a> |
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page and a description of the POSIX API in the |
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<a href="pcreposix.html"><b>pcreposix</b></a> |
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page. |
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<p> |
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Return to the <a href="index.html">PCRE index page</a>. |
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</p> |
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