1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>xmlregexp: regular expressions handling</title> 5<meta name="generator" content="Libxml2 devhelp stylesheet"> 6<link rel="start" href="index.html" title="libxml2 Reference Manual"> 7<link rel="up" href="general.html" title="API"> 8<link rel="stylesheet" href="style.css" type="text/css"> 9<link rel="chapter" href="general.html" title="API"> 10</head> 11<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 12<table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"> 13<td><a accesskey="p" href="libxml2-xmlreader.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> 14<td><a accesskey="u" href="general.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td> 15<td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td> 16<td><a accesskey="n" href="libxml2-xmlsave.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> 17<th width="100%" align="center">libxml2 Reference Manual</th> 18</tr></table> 19<h2><span class="refentrytitle">xmlregexp</span></h2> 20<p>xmlregexp - regular expressions handling</p> 21<p>basic API for libxml regular expressions handling used for XML Schemas and validation. </p> 22<p>Author(s): Daniel Veillard </p> 23<div class="refsynopsisdiv"> 24<h2>Synopsis</h2> 25<pre class="synopsis">typedef struct _xmlExpCtxt <a href="#xmlExpCtxt">xmlExpCtxt</a>; 26typedef <a href="libxml2-xmlregexp.html#xmlExpCtxt">xmlExpCtxt</a> * <a href="#xmlExpCtxtPtr">xmlExpCtxtPtr</a>; 27typedef struct _xmlExpNode <a href="#xmlExpNode">xmlExpNode</a>; 28typedef <a href="libxml2-xmlregexp.html#xmlExpNode">xmlExpNode</a> * <a href="#xmlExpNodePtr">xmlExpNodePtr</a>; 29typedef enum <a href="#xmlExpNodeType">xmlExpNodeType</a>; 30typedef struct _xmlRegExecCtxt <a href="#xmlRegExecCtxt">xmlRegExecCtxt</a>; 31typedef <a href="libxml2-xmlregexp.html#xmlRegExecCtxt">xmlRegExecCtxt</a> * <a href="#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a>; 32typedef struct _xmlRegexp <a href="#xmlRegexp">xmlRegexp</a>; 33typedef <a href="libxml2-xmlregexp.html#xmlRegexp">xmlRegexp</a> * <a href="#xmlRegexpPtr">xmlRegexpPtr</a>; 34int <a href="#xmlExpCtxtNbCons">xmlExpCtxtNbCons</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt); 35int <a href="#xmlExpCtxtNbNodes">xmlExpCtxtNbNodes</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt); 36void <a href="#xmlExpDump">xmlExpDump</a> (<a href="libxml2-tree.html#xmlBufferPtr">xmlBufferPtr</a> buf, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> expr); 37<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpExpDerive">xmlExpExpDerive</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> sub); 38void <a href="#xmlExpFree">xmlExpFree</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp); 39void <a href="#xmlExpFreeCtxt">xmlExpFreeCtxt</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt); 40int <a href="#xmlExpGetLanguage">xmlExpGetLanguage</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** langList, <br> int len); 41int <a href="#xmlExpGetStart">xmlExpGetStart</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** tokList, <br> int len); 42int <a href="#xmlExpIsNillable">xmlExpIsNillable</a> (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp); 43int <a href="#xmlExpMaxToken">xmlExpMaxToken</a> (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> expr); 44<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpNewAtom">xmlExpNewAtom</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len); 45<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> <a href="#xmlExpNewCtxt">xmlExpNewCtxt</a> (int maxNodes, <br> <a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict); 46<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpNewOr">xmlExpNewOr</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> left, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> right); 47<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpNewRange">xmlExpNewRange</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> subset, <br> int min, <br> int max); 48<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpNewSeq">xmlExpNewSeq</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> left, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> right); 49<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpParse">xmlExpParse</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> const char * expr); 50void <a href="#xmlExpRef">xmlExpRef</a> (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp); 51<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> <a href="#xmlExpStringDerive">xmlExpStringDerive</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> int len); 52int <a href="#xmlExpSubsume">xmlExpSubsume</a> (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> sub); 53typedef void <a href="#xmlRegExecCallbacks">xmlRegExecCallbacks</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * token, <br> void * transdata, <br> void * inputdata); 54int <a href="#xmlRegExecErrInfo">xmlRegExecErrInfo</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** string, <br> int * nbval, <br> int * nbneg, <br> <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** values, <br> int * terminal); 55int <a href="#xmlRegExecNextValues">xmlRegExecNextValues</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> int * nbval, <br> int * nbneg, <br> <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** values, <br> int * terminal); 56int <a href="#xmlRegExecPushString">xmlRegExecPushString</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value, <br> void * data); 57int <a href="#xmlRegExecPushString2">xmlRegExecPushString2</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value2, <br> void * data); 58void <a href="#xmlRegFreeExecCtxt">xmlRegFreeExecCtxt</a> (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec); 59void <a href="#xmlRegFreeRegexp">xmlRegFreeRegexp</a> (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> regexp); 60<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> <a href="#xmlRegNewExecCtxt">xmlRegNewExecCtxt</a> (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp, <br> <a href="libxml2-xmlregexp.html#xmlRegExecCallbacks">xmlRegExecCallbacks</a> callback, <br> void * data); 61<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> <a href="#xmlRegexpCompile">xmlRegexpCompile</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * regexp); 62int <a href="#xmlRegexpExec">xmlRegexpExec</a> (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * content); 63int <a href="#xmlRegexpIsDeterminist">xmlRegexpIsDeterminist</a> (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp); 64void <a href="#xmlRegexpPrint">xmlRegexpPrint</a> (FILE * output, <br> <a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> regexp); 65</pre> 66</div> 67<div class="refsect1" lang="en"><h2>Description</h2></div> 68<div class="refsect1" lang="en"> 69<h2>Details</h2> 70<div class="refsect2" lang="en"> 71<div class="refsect2" lang="en"> 72<h3> 73<a name="xmlExpCtxt">Structure </a>xmlExpCtxt</h3> 74<pre class="programlisting">struct _xmlExpCtxt { 75The content of this structure is not made public by the API. 76} xmlExpCtxt; 77</pre> 78<p></p> 79</div> 80<hr> 81<div class="refsect2" lang="en"> 82<h3> 83<a name="xmlExpCtxtPtr">Typedef </a>xmlExpCtxtPtr</h3> 84<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpCtxt">xmlExpCtxt</a> * xmlExpCtxtPtr; 85</pre> 86<p></p> 87</div> 88<hr> 89<div class="refsect2" lang="en"> 90<h3> 91<a name="xmlExpNode">Structure </a>xmlExpNode</h3> 92<pre class="programlisting">struct _xmlExpNode { 93The content of this structure is not made public by the API. 94} xmlExpNode; 95</pre> 96<p></p> 97</div> 98<hr> 99<div class="refsect2" lang="en"> 100<h3> 101<a name="xmlExpNodePtr">Typedef </a>xmlExpNodePtr</h3> 102<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNode">xmlExpNode</a> * xmlExpNodePtr; 103</pre> 104<p></p> 105</div> 106<hr> 107<div class="refsect2" lang="en"> 108<h3> 109<a name="xmlExpNodeType">Enum </a>xmlExpNodeType</h3> 110<pre class="programlisting">enum <a href="#xmlExpNodeType">xmlExpNodeType</a> { 111 <a name="XML_EXP_EMPTY">XML_EXP_EMPTY</a> = 0 112 <a name="XML_EXP_FORBID">XML_EXP_FORBID</a> = 1 113 <a name="XML_EXP_ATOM">XML_EXP_ATOM</a> = 2 114 <a name="XML_EXP_SEQ">XML_EXP_SEQ</a> = 3 115 <a name="XML_EXP_OR">XML_EXP_OR</a> = 4 116 <a name="XML_EXP_COUNT">XML_EXP_COUNT</a> = 5 117}; 118</pre> 119<p></p> 120</div> 121<hr> 122<div class="refsect2" lang="en"> 123<h3> 124<a name="xmlRegExecCtxt">Structure </a>xmlRegExecCtxt</h3> 125<pre class="programlisting">struct _xmlRegExecCtxt { 126The content of this structure is not made public by the API. 127} xmlRegExecCtxt; 128</pre> 129<p></p> 130</div> 131<hr> 132<div class="refsect2" lang="en"> 133<h3> 134<a name="xmlRegExecCtxtPtr">Typedef </a>xmlRegExecCtxtPtr</h3> 135<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlRegExecCtxt">xmlRegExecCtxt</a> * xmlRegExecCtxtPtr; 136</pre> 137<p>A libxml progressive regular expression evaluation context</p> 138</div> 139<hr> 140<div class="refsect2" lang="en"> 141<h3> 142<a name="xmlRegexp">Structure </a>xmlRegexp</h3> 143<pre class="programlisting">struct _xmlRegexp { 144The content of this structure is not made public by the API. 145} xmlRegexp; 146</pre> 147<p></p> 148</div> 149<hr> 150<div class="refsect2" lang="en"> 151<h3> 152<a name="xmlRegexpPtr">Typedef </a>xmlRegexpPtr</h3> 153<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlRegexp">xmlRegexp</a> * xmlRegexpPtr; 154</pre> 155<p>A libxml regular expression, they can actually be far more complex thank the POSIX regex expressions.</p> 156</div> 157<hr> 158<div class="refsect2" lang="en"> 159<h3> 160<a name="xmlRegExecCallbacks"></a>Function type xmlRegExecCallbacks</h3> 161<pre class="programlisting">void xmlRegExecCallbacks (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * token, <br> void * transdata, <br> void * inputdata)<br> 162</pre> 163<p>Callback function when doing a transition in the automata</p> 164<div class="variablelist"><table border="0"> 165<col align="left"> 166<tbody> 167<tr> 168<td><span class="term"><i><tt>exec</tt></i>:</span></td> 169<td>the regular expression context</td> 170</tr> 171<tr> 172<td><span class="term"><i><tt>token</tt></i>:</span></td> 173<td>the current token string</td> 174</tr> 175<tr> 176<td><span class="term"><i><tt>transdata</tt></i>:</span></td> 177<td>transition data</td> 178</tr> 179<tr> 180<td><span class="term"><i><tt>inputdata</tt></i>:</span></td> 181<td>input data</td> 182</tr> 183</tbody> 184</table></div> 185</div> 186<hr> 187<div class="refsect2" lang="en"> 188<h3> 189<a name="emptyExp">Variable </a>emptyExp</h3> 190<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> emptyExp; 191</pre> 192<p></p> 193</div> 194<hr> 195<div class="refsect2" lang="en"> 196<h3> 197<a name="forbiddenExp">Variable </a>forbiddenExp</h3> 198<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> forbiddenExp; 199</pre> 200<p></p> 201</div> 202<hr> 203<div class="refsect2" lang="en"> 204<h3> 205<a name="xmlExpCtxtNbCons"></a>xmlExpCtxtNbCons ()</h3> 206<pre class="programlisting">int xmlExpCtxtNbCons (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt)<br> 207</pre> 208<p>Debugging facility provides the number of allocated nodes over lifetime</p> 209<div class="variablelist"><table border="0"> 210<col align="left"> 211<tbody> 212<tr> 213<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 214<td>an expression context</td> 215</tr> 216<tr> 217<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 218<td>the number of nodes ever allocated or -1 in case of error</td> 219</tr> 220</tbody> 221</table></div> 222</div> 223<hr> 224<div class="refsect2" lang="en"> 225<h3> 226<a name="xmlExpCtxtNbNodes"></a>xmlExpCtxtNbNodes ()</h3> 227<pre class="programlisting">int xmlExpCtxtNbNodes (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt)<br> 228</pre> 229<p>Debugging facility provides the number of allocated nodes at a that point</p> 230<div class="variablelist"><table border="0"> 231<col align="left"> 232<tbody> 233<tr> 234<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 235<td>an expression context</td> 236</tr> 237<tr> 238<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 239<td>the number of nodes in use or -1 in case of error</td> 240</tr> 241</tbody> 242</table></div> 243</div> 244<hr> 245<div class="refsect2" lang="en"> 246<h3> 247<a name="xmlExpDump"></a>xmlExpDump ()</h3> 248<pre class="programlisting">void xmlExpDump (<a href="libxml2-tree.html#xmlBufferPtr">xmlBufferPtr</a> buf, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> expr)<br> 249</pre> 250<p>Serialize the expression as compiled to the buffer</p> 251<div class="variablelist"><table border="0"> 252<col align="left"> 253<tbody> 254<tr> 255<td><span class="term"><i><tt>buf</tt></i>:</span></td> 256<td>a buffer to receive the output</td> 257</tr> 258<tr> 259<td><span class="term"><i><tt>expr</tt></i>:</span></td> 260<td>the compiled expression</td> 261</tr> 262</tbody> 263</table></div> 264</div> 265<hr> 266<div class="refsect2" lang="en"> 267<h3> 268<a name="xmlExpExpDerive"></a>xmlExpExpDerive ()</h3> 269<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpExpDerive (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> sub)<br> 270</pre> 271<p>Evaluates the expression resulting from @exp consuming a sub expression @sub Based on algebraic derivation and sometimes direct Brzozowski derivation it usually takes less than linear time and can handle expressions generating infinite languages.</p> 272<div class="variablelist"><table border="0"> 273<col align="left"> 274<tbody> 275<tr> 276<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 277<td>the expressions context</td> 278</tr> 279<tr> 280<td><span class="term"><i><tt>exp</tt></i>:</span></td> 281<td>the englobing expression</td> 282</tr> 283<tr> 284<td><span class="term"><i><tt>sub</tt></i>:</span></td> 285<td>the subexpression</td> 286</tr> 287<tr> 288<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 289<td>the resulting expression or NULL in case of internal error, the result must be freed</td> 290</tr> 291</tbody> 292</table></div> 293</div> 294<hr> 295<div class="refsect2" lang="en"> 296<h3> 297<a name="xmlExpFree"></a>xmlExpFree ()</h3> 298<pre class="programlisting">void xmlExpFree (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp)<br> 299</pre> 300<p>Dereference the expression</p> 301<div class="variablelist"><table border="0"> 302<col align="left"> 303<tbody> 304<tr> 305<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 306<td>the expression context</td> 307</tr> 308<tr> 309<td><span class="term"><i><tt>exp</tt></i>:</span></td> 310<td>the expression</td> 311</tr> 312</tbody> 313</table></div> 314</div> 315<hr> 316<div class="refsect2" lang="en"> 317<h3> 318<a name="xmlExpFreeCtxt"></a>xmlExpFreeCtxt ()</h3> 319<pre class="programlisting">void xmlExpFreeCtxt (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt)<br> 320</pre> 321<p>Free an expression context</p> 322<div class="variablelist"><table border="0"> 323<col align="left"> 324<tbody><tr> 325<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 326<td>an expression context</td> 327</tr></tbody> 328</table></div> 329</div> 330<hr> 331<div class="refsect2" lang="en"> 332<h3> 333<a name="xmlExpGetLanguage"></a>xmlExpGetLanguage ()</h3> 334<pre class="programlisting">int xmlExpGetLanguage (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** langList, <br> int len)<br> 335</pre> 336<p>Find all the strings used in @exp and store them in @list</p> 337<div class="variablelist"><table border="0"> 338<col align="left"> 339<tbody> 340<tr> 341<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 342<td>the expression context</td> 343</tr> 344<tr> 345<td><span class="term"><i><tt>exp</tt></i>:</span></td> 346<td>the expression</td> 347</tr> 348<tr> 349<td><span class="term"><i><tt>langList</tt></i>:</span></td> 350<td>where to store the tokens</td> 351</tr> 352<tr> 353<td><span class="term"><i><tt>len</tt></i>:</span></td> 354<td>the allocated length of @list</td> 355</tr> 356<tr> 357<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 358<td>the number of unique strings found, -1 in case of errors and -2 if there is more than @len strings</td> 359</tr> 360</tbody> 361</table></div> 362</div> 363<hr> 364<div class="refsect2" lang="en"> 365<h3> 366<a name="xmlExpGetStart"></a>xmlExpGetStart ()</h3> 367<pre class="programlisting">int xmlExpGetStart (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** tokList, <br> int len)<br> 368</pre> 369<p>Find all the strings that appears at the start of the languages accepted by @exp and store them in @list. E.g. for (a, b) | c it will return the list [a, c]</p> 370<div class="variablelist"><table border="0"> 371<col align="left"> 372<tbody> 373<tr> 374<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 375<td>the expression context</td> 376</tr> 377<tr> 378<td><span class="term"><i><tt>exp</tt></i>:</span></td> 379<td>the expression</td> 380</tr> 381<tr> 382<td><span class="term"><i><tt>tokList</tt></i>:</span></td> 383<td>where to store the tokens</td> 384</tr> 385<tr> 386<td><span class="term"><i><tt>len</tt></i>:</span></td> 387<td>the allocated length of @list</td> 388</tr> 389<tr> 390<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 391<td>the number of unique strings found, -1 in case of errors and -2 if there is more than @len strings</td> 392</tr> 393</tbody> 394</table></div> 395</div> 396<hr> 397<div class="refsect2" lang="en"> 398<h3> 399<a name="xmlExpIsNillable"></a>xmlExpIsNillable ()</h3> 400<pre class="programlisting">int xmlExpIsNillable (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp)<br> 401</pre> 402<p>Finds if the expression is nillable, i.e. if it accepts the empty sequence</p> 403<div class="variablelist"><table border="0"> 404<col align="left"> 405<tbody> 406<tr> 407<td><span class="term"><i><tt>exp</tt></i>:</span></td> 408<td>the expression</td> 409</tr> 410<tr> 411<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 412<td>1 if nillable, 0 if not and -1 in case of error</td> 413</tr> 414</tbody> 415</table></div> 416</div> 417<hr> 418<div class="refsect2" lang="en"> 419<h3> 420<a name="xmlExpMaxToken"></a>xmlExpMaxToken ()</h3> 421<pre class="programlisting">int xmlExpMaxToken (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> expr)<br> 422</pre> 423<p>Indicate the maximum number of input a expression can accept</p> 424<div class="variablelist"><table border="0"> 425<col align="left"> 426<tbody> 427<tr> 428<td><span class="term"><i><tt>expr</tt></i>:</span></td> 429<td>a compiled expression</td> 430</tr> 431<tr> 432<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 433<td>the maximum length or -1 in case of error</td> 434</tr> 435</tbody> 436</table></div> 437</div> 438<hr> 439<div class="refsect2" lang="en"> 440<h3> 441<a name="xmlExpNewAtom"></a>xmlExpNewAtom ()</h3> 442<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpNewAtom (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> int len)<br> 443</pre> 444<p>Get the atom associated to this name from that context</p> 445<div class="variablelist"><table border="0"> 446<col align="left"> 447<tbody> 448<tr> 449<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 450<td>the expression context</td> 451</tr> 452<tr> 453<td><span class="term"><i><tt>name</tt></i>:</span></td> 454<td>the atom name</td> 455</tr> 456<tr> 457<td><span class="term"><i><tt>len</tt></i>:</span></td> 458<td>the atom name length in byte (or -1);</td> 459</tr> 460<tr> 461<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 462<td>the node or NULL in case of error</td> 463</tr> 464</tbody> 465</table></div> 466</div> 467<hr> 468<div class="refsect2" lang="en"> 469<h3> 470<a name="xmlExpNewCtxt"></a>xmlExpNewCtxt ()</h3> 471<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> xmlExpNewCtxt (int maxNodes, <br> <a href="libxml2-dict.html#xmlDictPtr">xmlDictPtr</a> dict)<br> 472</pre> 473<p>Creates a new context for manipulating expressions</p> 474<div class="variablelist"><table border="0"> 475<col align="left"> 476<tbody> 477<tr> 478<td><span class="term"><i><tt>maxNodes</tt></i>:</span></td> 479<td>the maximum number of nodes</td> 480</tr> 481<tr> 482<td><span class="term"><i><tt>dict</tt></i>:</span></td> 483<td>optional dictionary to use internally</td> 484</tr> 485<tr> 486<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 487<td>the context or NULL in case of error</td> 488</tr> 489</tbody> 490</table></div> 491</div> 492<hr> 493<div class="refsect2" lang="en"> 494<h3> 495<a name="xmlExpNewOr"></a>xmlExpNewOr ()</h3> 496<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpNewOr (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> left, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> right)<br> 497</pre> 498<p>Get the atom associated to the choice @left | @right Note that @left and @right are consumed in the operation, to keep an handle on them use xmlExpRef() and use xmlExpFree() to release them, this is true even in case of failure (unless ctxt == NULL).</p> 499<div class="variablelist"><table border="0"> 500<col align="left"> 501<tbody> 502<tr> 503<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 504<td>the expression context</td> 505</tr> 506<tr> 507<td><span class="term"><i><tt>left</tt></i>:</span></td> 508<td>left expression</td> 509</tr> 510<tr> 511<td><span class="term"><i><tt>right</tt></i>:</span></td> 512<td>right expression</td> 513</tr> 514<tr> 515<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 516<td>the node or NULL in case of error</td> 517</tr> 518</tbody> 519</table></div> 520</div> 521<hr> 522<div class="refsect2" lang="en"> 523<h3> 524<a name="xmlExpNewRange"></a>xmlExpNewRange ()</h3> 525<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpNewRange (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> subset, <br> int min, <br> int max)<br> 526</pre> 527<p>Get the atom associated to the range (@subset){@min, @max} Note that @subset is consumed in the operation, to keep an handle on it use xmlExpRef() and use xmlExpFree() to release it, this is true even in case of failure (unless ctxt == NULL).</p> 528<div class="variablelist"><table border="0"> 529<col align="left"> 530<tbody> 531<tr> 532<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 533<td>the expression context</td> 534</tr> 535<tr> 536<td><span class="term"><i><tt>subset</tt></i>:</span></td> 537<td>the expression to be repeated</td> 538</tr> 539<tr> 540<td><span class="term"><i><tt>min</tt></i>:</span></td> 541<td>the lower bound for the repetition</td> 542</tr> 543<tr> 544<td><span class="term"><i><tt>max</tt></i>:</span></td> 545<td>the upper bound for the repetition, -1 means infinite</td> 546</tr> 547<tr> 548<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 549<td>the node or NULL in case of error</td> 550</tr> 551</tbody> 552</table></div> 553</div> 554<hr> 555<div class="refsect2" lang="en"> 556<h3> 557<a name="xmlExpNewSeq"></a>xmlExpNewSeq ()</h3> 558<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpNewSeq (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> left, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> right)<br> 559</pre> 560<p>Get the atom associated to the sequence @left , @right Note that @left and @right are consumed in the operation, to keep an handle on them use xmlExpRef() and use xmlExpFree() to release them, this is true even in case of failure (unless ctxt == NULL).</p> 561<div class="variablelist"><table border="0"> 562<col align="left"> 563<tbody> 564<tr> 565<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 566<td>the expression context</td> 567</tr> 568<tr> 569<td><span class="term"><i><tt>left</tt></i>:</span></td> 570<td>left expression</td> 571</tr> 572<tr> 573<td><span class="term"><i><tt>right</tt></i>:</span></td> 574<td>right expression</td> 575</tr> 576<tr> 577<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 578<td>the node or NULL in case of error</td> 579</tr> 580</tbody> 581</table></div> 582</div> 583<hr> 584<div class="refsect2" lang="en"> 585<h3> 586<a name="xmlExpParse"></a>xmlExpParse ()</h3> 587<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpParse (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> const char * expr)<br> 588</pre> 589<p>Minimal parser for regexps, it understand the following constructs - string terminals - choice operator | - sequence operator , - subexpressions (...) - usual cardinality operators + * and ? - finite sequences { min, max } - infinite sequences { min, * } There is minimal checkings made especially no checking on strings values</p> 590<div class="variablelist"><table border="0"> 591<col align="left"> 592<tbody> 593<tr> 594<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 595<td>the expressions context</td> 596</tr> 597<tr> 598<td><span class="term"><i><tt>expr</tt></i>:</span></td> 599<td>the 0 terminated string</td> 600</tr> 601<tr> 602<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 603<td>a new expression or NULL in case of failure</td> 604</tr> 605</tbody> 606</table></div> 607</div> 608<hr> 609<div class="refsect2" lang="en"> 610<h3> 611<a name="xmlExpRef"></a>xmlExpRef ()</h3> 612<pre class="programlisting">void xmlExpRef (<a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp)<br> 613</pre> 614<p>Increase the <a href="libxml2-SAX.html#reference">reference</a> count of the expression</p> 615<div class="variablelist"><table border="0"> 616<col align="left"> 617<tbody><tr> 618<td><span class="term"><i><tt>exp</tt></i>:</span></td> 619<td>the expression</td> 620</tr></tbody> 621</table></div> 622</div> 623<hr> 624<div class="refsect2" lang="en"> 625<h3> 626<a name="xmlExpStringDerive"></a>xmlExpStringDerive ()</h3> 627<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> xmlExpStringDerive (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * str, <br> int len)<br> 628</pre> 629<p>Do one step of Brzozowski derivation of the expression @exp with respect to the input string</p> 630<div class="variablelist"><table border="0"> 631<col align="left"> 632<tbody> 633<tr> 634<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 635<td>the expression context</td> 636</tr> 637<tr> 638<td><span class="term"><i><tt>exp</tt></i>:</span></td> 639<td>the expression</td> 640</tr> 641<tr> 642<td><span class="term"><i><tt>str</tt></i>:</span></td> 643<td>the string</td> 644</tr> 645<tr> 646<td><span class="term"><i><tt>len</tt></i>:</span></td> 647<td>the string len in bytes if available</td> 648</tr> 649<tr> 650<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 651<td>the resulting expression or NULL in case of internal error</td> 652</tr> 653</tbody> 654</table></div> 655</div> 656<hr> 657<div class="refsect2" lang="en"> 658<h3> 659<a name="xmlExpSubsume"></a>xmlExpSubsume ()</h3> 660<pre class="programlisting">int xmlExpSubsume (<a href="libxml2-xmlregexp.html#xmlExpCtxtPtr">xmlExpCtxtPtr</a> ctxt, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> exp, <br> <a href="libxml2-xmlregexp.html#xmlExpNodePtr">xmlExpNodePtr</a> sub)<br> 661</pre> 662<p>Check whether @exp accepts all the languages accepted by @sub the input being a subexpression.</p> 663<div class="variablelist"><table border="0"> 664<col align="left"> 665<tbody> 666<tr> 667<td><span class="term"><i><tt>ctxt</tt></i>:</span></td> 668<td>the expressions context</td> 669</tr> 670<tr> 671<td><span class="term"><i><tt>exp</tt></i>:</span></td> 672<td>the englobing expression</td> 673</tr> 674<tr> 675<td><span class="term"><i><tt>sub</tt></i>:</span></td> 676<td>the subexpression</td> 677</tr> 678<tr> 679<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 680<td>1 if true 0 if false and -1 in case of failure.</td> 681</tr> 682</tbody> 683</table></div> 684</div> 685<hr> 686<div class="refsect2" lang="en"> 687<h3> 688<a name="xmlRegExecErrInfo"></a>xmlRegExecErrInfo ()</h3> 689<pre class="programlisting">int xmlRegExecErrInfo (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** string, <br> int * nbval, <br> int * nbneg, <br> <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** values, <br> int * terminal)<br> 690</pre> 691<p>Extract error information from the regexp execution, the parameter @string will be updated with the value pushed and not accepted, the parameter @values must point to an array of @nbval string pointers on return nbval will contain the number of possible strings in that state and the @values array will be updated with them. The string values</p> 692<div class="variablelist"><table border="0"> 693<col align="left"> 694<tbody> 695<tr> 696<td><span class="term"><i><tt>exec</tt></i>:</span></td> 697<td>a regexp execution context generating an error</td> 698</tr> 699<tr> 700<td><span class="term"><i><tt>string</tt></i>:</span></td> 701<td>return value for the error string</td> 702</tr> 703<tr> 704<td><span class="term"><i><tt>nbval</tt></i>:</span></td> 705<td>pointer to the number of accepted values IN/OUT</td> 706</tr> 707<tr> 708<td><span class="term"><i><tt>nbneg</tt></i>:</span></td> 709<td>return number of negative transitions</td> 710</tr> 711<tr> 712<td><span class="term"><i><tt>values</tt></i>:</span></td> 713<td>pointer to the array of acceptable values</td> 714</tr> 715<tr> 716<td><span class="term"><i><tt>terminal</tt></i>:</span></td> 717<td>return value if this was a terminal state</td> 718</tr> 719<tr> 720<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 721<td>will be freed with the @exec context and don't need to be deallocated. Returns: 0 in case of success or -1 in case of error.</td> 722</tr> 723</tbody> 724</table></div> 725</div> 726<hr> 727<div class="refsect2" lang="en"> 728<h3> 729<a name="xmlRegExecNextValues"></a>xmlRegExecNextValues ()</h3> 730<pre class="programlisting">int xmlRegExecNextValues (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> int * nbval, <br> int * nbneg, <br> <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** values, <br> int * terminal)<br> 731</pre> 732<p>Extract information from the regexp execution, the parameter @values must point to an array of @nbval string pointers on return nbval will contain the number of possible strings in that state and the @values array will be updated with them. The string values</p> 733<div class="variablelist"><table border="0"> 734<col align="left"> 735<tbody> 736<tr> 737<td><span class="term"><i><tt>exec</tt></i>:</span></td> 738<td>a regexp execution context</td> 739</tr> 740<tr> 741<td><span class="term"><i><tt>nbval</tt></i>:</span></td> 742<td>pointer to the number of accepted values IN/OUT</td> 743</tr> 744<tr> 745<td><span class="term"><i><tt>nbneg</tt></i>:</span></td> 746<td>return number of negative transitions</td> 747</tr> 748<tr> 749<td><span class="term"><i><tt>values</tt></i>:</span></td> 750<td>pointer to the array of acceptable values</td> 751</tr> 752<tr> 753<td><span class="term"><i><tt>terminal</tt></i>:</span></td> 754<td>return value if this was a terminal state</td> 755</tr> 756<tr> 757<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 758<td>will be freed with the @exec context and don't need to be deallocated. Returns: 0 in case of success or -1 in case of error.</td> 759</tr> 760</tbody> 761</table></div> 762</div> 763<hr> 764<div class="refsect2" lang="en"> 765<h3> 766<a name="xmlRegExecPushString"></a>xmlRegExecPushString ()</h3> 767<pre class="programlisting">int xmlRegExecPushString (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value, <br> void * data)<br> 768</pre> 769<p>Push one input token in the execution context</p> 770<div class="variablelist"><table border="0"> 771<col align="left"> 772<tbody> 773<tr> 774<td><span class="term"><i><tt>exec</tt></i>:</span></td> 775<td>a regexp execution context or NULL to indicate the end</td> 776</tr> 777<tr> 778<td><span class="term"><i><tt>value</tt></i>:</span></td> 779<td>a string token input</td> 780</tr> 781<tr> 782<td><span class="term"><i><tt>data</tt></i>:</span></td> 783<td>data associated to the token to reuse in callbacks</td> 784</tr> 785<tr> 786<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 787<td>1 if the regexp reached a final state, 0 if non-final, and a negative value in case of error.</td> 788</tr> 789</tbody> 790</table></div> 791</div> 792<hr> 793<div class="refsect2" lang="en"> 794<h3> 795<a name="xmlRegExecPushString2"></a>xmlRegExecPushString2 ()</h3> 796<pre class="programlisting">int xmlRegExecPushString2 (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * value2, <br> void * data)<br> 797</pre> 798<p>Push one input token in the execution context</p> 799<div class="variablelist"><table border="0"> 800<col align="left"> 801<tbody> 802<tr> 803<td><span class="term"><i><tt>exec</tt></i>:</span></td> 804<td>a regexp execution context or NULL to indicate the end</td> 805</tr> 806<tr> 807<td><span class="term"><i><tt>value</tt></i>:</span></td> 808<td>the first string token input</td> 809</tr> 810<tr> 811<td><span class="term"><i><tt>value2</tt></i>:</span></td> 812<td>the second string token input</td> 813</tr> 814<tr> 815<td><span class="term"><i><tt>data</tt></i>:</span></td> 816<td>data associated to the token to reuse in callbacks</td> 817</tr> 818<tr> 819<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 820<td>1 if the regexp reached a final state, 0 if non-final, and a negative value in case of error.</td> 821</tr> 822</tbody> 823</table></div> 824</div> 825<hr> 826<div class="refsect2" lang="en"> 827<h3> 828<a name="xmlRegFreeExecCtxt"></a>xmlRegFreeExecCtxt ()</h3> 829<pre class="programlisting">void xmlRegFreeExecCtxt (<a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> exec)<br> 830</pre> 831<p>Free the structures associated to a regular expression evaluation context.</p> 832<div class="variablelist"><table border="0"> 833<col align="left"> 834<tbody><tr> 835<td><span class="term"><i><tt>exec</tt></i>:</span></td> 836<td>a regular expression evaluation context</td> 837</tr></tbody> 838</table></div> 839</div> 840<hr> 841<div class="refsect2" lang="en"> 842<h3> 843<a name="xmlRegFreeRegexp"></a>xmlRegFreeRegexp ()</h3> 844<pre class="programlisting">void xmlRegFreeRegexp (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> regexp)<br> 845</pre> 846<p>Free a regexp</p> 847<div class="variablelist"><table border="0"> 848<col align="left"> 849<tbody><tr> 850<td><span class="term"><i><tt>regexp</tt></i>:</span></td> 851<td>the regexp</td> 852</tr></tbody> 853</table></div> 854</div> 855<hr> 856<div class="refsect2" lang="en"> 857<h3> 858<a name="xmlRegNewExecCtxt"></a>xmlRegNewExecCtxt ()</h3> 859<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlRegExecCtxtPtr">xmlRegExecCtxtPtr</a> xmlRegNewExecCtxt (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp, <br> <a href="libxml2-xmlregexp.html#xmlRegExecCallbacks">xmlRegExecCallbacks</a> callback, <br> void * data)<br> 860</pre> 861<p>Build a context used for progressive evaluation of a regexp.</p> 862<div class="variablelist"><table border="0"> 863<col align="left"> 864<tbody> 865<tr> 866<td><span class="term"><i><tt>comp</tt></i>:</span></td> 867<td>a precompiled regular expression</td> 868</tr> 869<tr> 870<td><span class="term"><i><tt>callback</tt></i>:</span></td> 871<td>a callback function used for handling progresses in the automata matching phase</td> 872</tr> 873<tr> 874<td><span class="term"><i><tt>data</tt></i>:</span></td> 875<td>the context data associated to the callback in this context</td> 876</tr> 877<tr> 878<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 879<td>the new context</td> 880</tr> 881</tbody> 882</table></div> 883</div> 884<hr> 885<div class="refsect2" lang="en"> 886<h3> 887<a name="xmlRegexpCompile"></a>xmlRegexpCompile ()</h3> 888<pre class="programlisting"><a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> xmlRegexpCompile (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * regexp)<br> 889</pre> 890<p>Parses a regular expression conforming to XML Schemas Part 2 Datatype Appendix F and builds an automata suitable for testing strings against that regular expression</p> 891<div class="variablelist"><table border="0"> 892<col align="left"> 893<tbody> 894<tr> 895<td><span class="term"><i><tt>regexp</tt></i>:</span></td> 896<td>a regular expression string</td> 897</tr> 898<tr> 899<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 900<td>the compiled expression or NULL in case of error</td> 901</tr> 902</tbody> 903</table></div> 904</div> 905<hr> 906<div class="refsect2" lang="en"> 907<h3> 908<a name="xmlRegexpExec"></a>xmlRegexpExec ()</h3> 909<pre class="programlisting">int xmlRegexpExec (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * content)<br> 910</pre> 911<p>Check if the regular expression generates the value</p> 912<div class="variablelist"><table border="0"> 913<col align="left"> 914<tbody> 915<tr> 916<td><span class="term"><i><tt>comp</tt></i>:</span></td> 917<td>the compiled regular expression</td> 918</tr> 919<tr> 920<td><span class="term"><i><tt>content</tt></i>:</span></td> 921<td>the value to check against the regular expression</td> 922</tr> 923<tr> 924<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 925<td>1 if it matches, 0 if not and a negative value in case of error</td> 926</tr> 927</tbody> 928</table></div> 929</div> 930<hr> 931<div class="refsect2" lang="en"> 932<h3> 933<a name="xmlRegexpIsDeterminist"></a>xmlRegexpIsDeterminist ()</h3> 934<pre class="programlisting">int xmlRegexpIsDeterminist (<a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> comp)<br> 935</pre> 936<p>Check if the regular expression is determinist</p> 937<div class="variablelist"><table border="0"> 938<col align="left"> 939<tbody> 940<tr> 941<td><span class="term"><i><tt>comp</tt></i>:</span></td> 942<td>the compiled regular expression</td> 943</tr> 944<tr> 945<td><span class="term"><i><tt>Returns</tt></i>:</span></td> 946<td>1 if it yes, 0 if not and a negative value in case of error</td> 947</tr> 948</tbody> 949</table></div> 950</div> 951<hr> 952<div class="refsect2" lang="en"> 953<h3> 954<a name="xmlRegexpPrint"></a>xmlRegexpPrint ()</h3> 955<pre class="programlisting">void xmlRegexpPrint (FILE * output, <br> <a href="libxml2-xmlregexp.html#xmlRegexpPtr">xmlRegexpPtr</a> regexp)<br> 956</pre> 957<p>Print the content of the compiled regular expression</p> 958<div class="variablelist"><table border="0"> 959<col align="left"> 960<tbody> 961<tr> 962<td><span class="term"><i><tt>output</tt></i>:</span></td> 963<td>the file for the output debug</td> 964</tr> 965<tr> 966<td><span class="term"><i><tt>regexp</tt></i>:</span></td> 967<td>the compiled regexp</td> 968</tr> 969</tbody> 970</table></div> 971</div> 972<hr> 973</div> 974</div> 975</body> 976</html> 977
