1<html> 2<head> 3<title>pcre_dfa_exec specification</title> 4</head> 5<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB"> 6<h1>pcre_dfa_exec man page</h1> 7<p> 8Return to the <a href="index.html">PCRE index page</a>. 9</p> 10<p> 11This page is part of the PCRE HTML documentation. It was generated automatically 12from the original man page. If there is any nonsense in it, please consult the 13man page, in case the conversion went wrong. 14<br> 15<br><b> 16SYNOPSIS 17</b><br> 18<P> 19<b>#include <pcre.h></b> 20</P> 21<P> 22<b>int pcre_dfa_exec(const pcre *<i>code</i>, const pcre_extra *<i>extra</i>,</b> 23<b>const char *<i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b> 24<b>int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>,</b> 25<b>int *<i>workspace</i>, int <i>wscount</i>);</b> 26</P> 27<P> 28<b>int pcre16_dfa_exec(const pcre16 *<i>code</i>, const pcre16_extra *<i>extra</i>,</b> 29<b>PCRE_SPTR16 <i>subject</i>, int <i>length</i>, int <i>startoffset</i>,</b> 30<b>int <i>options</i>, int *<i>ovector</i>, int <i>ovecsize</i>,</b> 31<b>int *<i>workspace</i>, int <i>wscount</i>);</b> 32</P> 33<br><b> 34DESCRIPTION 35</b><br> 36<P> 37This function matches a compiled regular expression against a given subject 38string, using an alternative matching algorithm that scans the subject string 39just once (<i>not</i> Perl-compatible). Note that the main, Perl-compatible, 40matching function is <b>pcre[16]_exec()</b>. The arguments for this function 41are: 42<pre> 43 <i>code</i> Points to the compiled pattern 44 <i>extra</i> Points to an associated <b>pcre[16]_extra</b> structure, 45 or is NULL 46 <i>subject</i> Points to the subject string 47 <i>length</i> Length of the subject string, in bytes 48 <i>startoffset</i> Offset in bytes in the subject at which to 49 start matching 50 <i>options</i> Option bits 51 <i>ovector</i> Points to a vector of ints for result offsets 52 <i>ovecsize</i> Number of elements in the vector 53 <i>workspace</i> Points to a vector of ints used as working space 54 <i>wscount</i> Number of elements in the vector 55</pre> 56The options are: 57<pre> 58 PCRE_ANCHORED Match only at the first position 59 PCRE_BSR_ANYCRLF \R matches only CR, LF, or CRLF 60 PCRE_BSR_UNICODE \R matches all Unicode line endings 61 PCRE_NEWLINE_ANY Recognize any Unicode newline sequence 62 PCRE_NEWLINE_ANYCRLF Recognize CR, LF, & CRLF as newline sequences 63 PCRE_NEWLINE_CR Recognize CR as the only newline sequence 64 PCRE_NEWLINE_CRLF Recognize CRLF as the only newline sequence 65 PCRE_NEWLINE_LF Recognize LF as the only newline sequence 66 PCRE_NOTBOL Subject is not the beginning of a line 67 PCRE_NOTEOL Subject is not the end of a line 68 PCRE_NOTEMPTY An empty string is not a valid match 69 PCRE_NOTEMPTY_ATSTART An empty string at the start of the subject 70 is not a valid match 71 PCRE_NO_START_OPTIMIZE Do not do "start-match" optimizations 72 PCRE_NO_UTF16_CHECK Do not check the subject for UTF-16 73 validity (only relevant if PCRE_UTF16 74 was set at compile time) 75 PCRE_NO_UTF8_CHECK Do not check the subject for UTF-8 76 validity (only relevant if PCRE_UTF8 77 was set at compile time) 78 PCRE_PARTIAL ) Return PCRE_ERROR_PARTIAL for a partial 79 PCRE_PARTIAL_SOFT ) match if no full matches are found 80 PCRE_PARTIAL_HARD Return PCRE_ERROR_PARTIAL for a partial match 81 even if there is a full match as well 82 PCRE_DFA_SHORTEST Return only the shortest match 83 PCRE_DFA_RESTART Restart after a partial match 84</pre> 85There are restrictions on what may appear in a pattern when using this matching 86function. Details are given in the 87<a href="pcrematching.html"><b>pcrematching</b></a> 88documentation. For details of partial matching, see the 89<a href="pcrepartial.html"><b>pcrepartial</b></a> 90page. 91</P> 92<P> 93A <b>pcre[16]_extra</b> structure contains the following fields: 94<pre> 95 <i>flags</i> Bits indicating which fields are set 96 <i>study_data</i> Opaque data from <b>pcre[16]_study()</b> 97 <i>match_limit</i> Limit on internal resource use 98 <i>match_limit_recursion</i> Limit on internal recursion depth 99 <i>callout_data</i> Opaque data passed back to callouts 100 <i>tables</i> Points to character tables or is NULL 101 <i>mark</i> For passing back a *MARK pointer 102 <i>executable_jit</i> Opaque data from JIT compilation 103</pre> 104The flag bits are PCRE_EXTRA_STUDY_DATA, PCRE_EXTRA_MATCH_LIMIT, 105PCRE_EXTRA_MATCH_LIMIT_RECURSION, PCRE_EXTRA_CALLOUT_DATA, 106PCRE_EXTRA_TABLES, PCRE_EXTRA_MARK and PCRE_EXTRA_EXECUTABLE_JIT. For this 107matching function, the <i>match_limit</i> and <i>match_limit_recursion</i> fields 108are not used, and must not be set. The PCRE_EXTRA_EXECUTABLE_JIT flag and 109the corresponding variable are ignored. 110</P> 111<P> 112There is a complete description of the PCRE native API in the 113<a href="pcreapi.html"><b>pcreapi</b></a> 114page and a description of the POSIX API in the 115<a href="pcreposix.html"><b>pcreposix</b></a> 116page. 117<p> 118Return to the <a href="index.html">PCRE index page</a>. 119</p> 120