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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer">
<h1 id="Lucene_Net_Analysis_Pattern_PatternTokenizer" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer" class="text-break">Class PatternTokenizer
</h1>
<div class="markdown level0 summary"><p>This tokenizer uses regex pattern matching to construct distinct tokens
for the input stream. It takes two arguments: &quot;pattern&quot; and &quot;group&quot;.
<p>
<ul><li>&quot;pattern&quot; is the regular expression.</li><li>&quot;group&quot; says which group to extract into tokens.</li></ul>
<p>
group=-1 (the default) is equivalent to &quot;split&quot;. In this case, the tokens will
be equivalent to the output from (without empty tokens):
<span class="xref">System.Text.RegularExpressions.Regex.Replace(System.String,System.String)</span>
</p>
<p>
Using group &gt;= 0 selects the matching group as the token. For example, if you have:<br></p>
<pre><code> pattern = \&apos;([^\&apos;]+)\&apos;
group = 0
input = aaa &apos;bbb&apos; &apos;ccc&apos;</code></pre>
<p>the output will be two tokens: &apos;bbb&apos; and &apos;ccc&apos; (including the &apos; marks). With the same input
but using group=1, the output would be: bbb and ccc (no &apos; marks)
</p>
<p>NOTE: This <span class="xref">Lucene.Net.Analysis.Tokenizer</span> does not output tokens that are of zero length.</p></p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><span class="xref">Lucene.Net.Util.AttributeSource</span></div>
<div class="level2"><span class="xref">Lucene.Net.Analysis.TokenStream</span></div>
<div class="level3"><span class="xref">Lucene.Net.Analysis.Tokenizer</span></div>
<div class="level4"><span class="xref">PatternTokenizer</span></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">System.IDisposable</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">Lucene.Net.Analysis.Tokenizer.m_input</span>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Analysis.Tokenizer.html#Lucene_Net_Analysis_Tokenizer_Dispose_System_Boolean_">Tokenizer.Dispose(Boolean)</a>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Analysis.Tokenizer.html#Lucene_Net_Analysis_Tokenizer_CorrectOffset_System_Int32_">Tokenizer.CorrectOffset(Int32)</a>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Analysis.Tokenizer.html#Lucene_Net_Analysis_Tokenizer_SetReader_System_IO_TextReader_">Tokenizer.SetReader(TextReader)</a>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenStream.Dispose()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeFactory()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeClassesEnumerator()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeImplsEnumerator()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.AddAttributeImpl(Lucene.Net.Util.Attribute)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.AddAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.HasAttributes</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.HasAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttribute&lt;T&gt;()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ClearAttributes()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CaptureState()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.RestoreState(Lucene.Net.Util.AttributeSource.State)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetHashCode()</span>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Util.AttributeSource.html#Lucene_Net_Util_AttributeSource_Equals_System_Object_">AttributeSource.Equals(Object)</a>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Util.AttributeSource.html#Lucene_Net_Util_AttributeSource_ReflectAsString_System_Boolean_">AttributeSource.ReflectAsString(Boolean)</a>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ReflectWith(Lucene.Net.Util.IAttributeReflector)</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CloneAttributes()</span>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.CopyTo(Lucene.Net.Util.AttributeSource)</span>
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<span class="xref">Lucene.Net.Util.AttributeSource.ToString()</span>
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<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
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<span class="xref">System.Object.GetType()</span>
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<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Analysis.Pattern.html">Lucene.Net.Analysis.Pattern</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Analysis.Common.dll</h6>
<h5 id="Lucene_Net_Analysis_Pattern_PatternTokenizer_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public sealed class PatternTokenizer : Tokenizer, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Analysis_Pattern_PatternTokenizer__ctor_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternTokenizer__ctor_Lucene_Net_Util_AttributeSource_AttributeFactory_System_IO_TextReader_System_Text_RegularExpressions_Regex_System_Int32_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.#ctor(Lucene.Net.Util.AttributeSource.AttributeFactory,System.IO.TextReader,System.Text.RegularExpressions.Regex,System.Int32)">PatternTokenizer(AttributeSource.AttributeFactory, TextReader, Regex, Int32)</h4>
<div class="markdown level1 summary"><p>creates a new <a class="xref" href="Lucene.Net.Analysis.Pattern.PatternTokenizer.html">PatternTokenizer</a> returning tokens from group (-1 for split functionality) </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public PatternTokenizer(AttributeSource.AttributeFactory factory, TextReader input, Regex pattern, int group)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">Lucene.Net.Util.AttributeSource.AttributeFactory</span></td>
<td><span class="parametername">factory</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">input</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Text.RegularExpressions.Regex</span></td>
<td><span class="parametername">pattern</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">group</span></td>
<td></td>
</tr>
</tbody>
</table>
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<span class="divider">|</span>
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</span>
<a id="Lucene_Net_Analysis_Pattern_PatternTokenizer__ctor_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternTokenizer__ctor_System_IO_TextReader_System_Text_RegularExpressions_Regex_System_Int32_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.#ctor(System.IO.TextReader,System.Text.RegularExpressions.Regex,System.Int32)">PatternTokenizer(TextReader, Regex, Int32)</h4>
<div class="markdown level1 summary"><p>creates a new <a class="xref" href="Lucene.Net.Analysis.Pattern.PatternTokenizer.html">PatternTokenizer</a> returning tokens from group (-1 for split functionality) </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public PatternTokenizer(TextReader input, Regex pattern, int group)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">input</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Text.RegularExpressions.Regex</span></td>
<td><span class="parametername">pattern</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">group</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Analysis_Pattern_PatternTokenizer_End_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.End*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternTokenizer_End" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.End">End()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override void End()</code></pre>
</div>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.TokenStream.End()</span></div>
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<a id="Lucene_Net_Analysis_Pattern_PatternTokenizer_IncrementToken_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.IncrementToken*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternTokenizer_IncrementToken" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.IncrementToken">IncrementToken()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override bool IncrementToken()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.TokenStream.IncrementToken()</span></div>
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<a id="Lucene_Net_Analysis_Pattern_PatternTokenizer_Reset_" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.Reset*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternTokenizer_Reset" data-uid="Lucene.Net.Analysis.Pattern.PatternTokenizer.Reset">Reset()</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override void Reset()</code></pre>
</div>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.Tokenizer.Reset()</span></div>
<h3 id="implements">Implements</h3>
<div>
<span class="xref">System.IDisposable</span>
</div>
<h3 id="seealso">See Also</h3>
<div class="seealso">
<div><span class="xref">System.Text.RegularExpressions.Regex</span></div>
</div>
</article>
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