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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter">
<h1 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter" class="text-break">Class WordDelimiterFilter
</h1>
<div class="markdown level0 summary"><p>Splits words into subwords and performs optional transformations on subword
groups. Words are split into subwords with the following rules:
<ul><li>split on intra-word delimiters (by default, all non alpha-numeric
characters): <code>&quot;Wi-Fi&quot;</code><code>&quot;Wi&quot;, &quot;Fi&quot;</code></li><li>split on case transitions: <code>&quot;PowerShot&quot;</code>
<code>&quot;Power&quot;, &quot;Shot&quot;</code></li><li>split on letter-number transitions: <code>&quot;SD500&quot;</code>
<code>&quot;SD&quot;, &quot;500&quot;</code></li><li>leading and trailing intra-word delimiters on each subword are ignored:
<code>&quot;//hello---there, &apos;dude&apos;&quot;</code>
<code>&quot;hello&quot;, &quot;there&quot;, &quot;dude&quot;</code></li><li>trailing &quot;&apos;s&quot; are removed for each subword: <code>&quot;O&apos;Neil&apos;s&quot;</code>
<code>&quot;O&quot;, &quot;Neil&quot;</code>
<ul>
<item>Note: this step isn&apos;t performed in a separate filter because of possible
subword combinations.</item>
</ul>
</li></ul>
<p>
The <strong>combinations</strong> parameter affects how subwords are combined:
<ul><li>combinations=&quot;0&quot; causes no subword combinations: <pre><code>&quot;PowerShot&quot;</code></pre>
<code>0:&quot;Power&quot;, 1:&quot;Shot&quot;</code> (0 and 1 are the token positions)</li><li>combinations=&quot;1&quot; means that in addition to the subwords, maximum runs of
non-numeric subwords are catenated and produced at the same position of the
last subword in the run:
<ul>
<item><code>&quot;PowerShot&quot;</code>
<code>0:&quot;Power&quot;, 1:&quot;Shot&quot; 1:&quot;PowerShot&quot;</code></item>
<item><code>&quot;A&apos;s+B&apos;s&amp;C&apos;s&quot;</code> -gt; <code>0:&quot;A&quot;, 1:&quot;B&quot;, 2:&quot;C&quot;, 2:&quot;ABC&quot;</code>
</item>
<item><code>&quot;Super-Duper-XL500-42-AutoCoder!&quot;</code>
<code>0:&quot;Super&quot;, 1:&quot;Duper&quot;, 2:&quot;XL&quot;, 2:&quot;SuperDuperXL&quot;, 3:&quot;500&quot; 4:&quot;42&quot;, 5:&quot;Auto&quot;, 6:&quot;Coder&quot;, 6:&quot;AutoCoder&quot;</code>
</item>
</ul>
</li></ul>
<p>
One use for <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.html">WordDelimiterFilter</a> is to help match words with different
subword delimiters. For example, if the source text contained &quot;wi-fi&quot; one may
want &quot;wifi&quot; &quot;WiFi&quot; &quot;wi-fi&quot; &quot;wi+fi&quot; queries to all match. One way of doing so
is to specify combinations=&quot;1&quot; in the analyzer used for indexing, and
combinations=&quot;0&quot; (the default) in the analyzer used for querying. Given that
the current <a class="xref" href="Lucene.Net.Analysis.Standard.StandardTokenizer.html">StandardTokenizer</a> immediately removes many intra-word
delimiters, it is recommended that this filter be used after a tokenizer that
does not do this (such as <a class="xref" href="Lucene.Net.Analysis.Core.WhitespaceTokenizer.html">WhitespaceTokenizer</a>).</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.TokenFilter</span></div>
<div class="level4"><span class="xref">WordDelimiterFilter</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.TokenFilter.m_input</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.TokenFilter.End()</span>
</div>
<div>
<a class="xref" href="https://lucenenet.apache.org/docs/4.8.0-beta00013/api/core/Lucene.Net.Analysis.TokenFilter.html#Lucene_Net_Analysis_TokenFilter_Dispose_System_Boolean_">TokenFilter.Dispose(Boolean)</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>
</div>
<div>
<span class="xref">Lucene.Net.Util.AttributeSource.ToString()</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
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<span class="xref">System.Object.GetType()</span>
</div>
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<span class="xref">System.Object.MemberwiseClone()</span>
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<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.html">Lucene.Net.Analysis.Miscellaneous</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.Analysis.Common.dll</h6>
<h5 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public sealed class WordDelimiterFilter : TokenFilter, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter__ctor_Lucene_Net_Util_LuceneVersion_Lucene_Net_Analysis_TokenStream_Lucene_Net_Analysis_Miscellaneous_WordDelimiterFlags_Lucene_Net_Analysis_Util_CharArraySet_.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.%23ctor(Lucene.Net.Util.LuceneVersion%2CLucene.Net.Analysis.TokenStream%2CLucene.Net.Analysis.Miscellaneous.WordDelimiterFlags%2CLucene.Net.Analysis.Util.CharArraySet)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter__ctor_" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter__ctor_Lucene_Net_Util_LuceneVersion_Lucene_Net_Analysis_TokenStream_Lucene_Net_Analysis_Miscellaneous_WordDelimiterFlags_Lucene_Net_Analysis_Util_CharArraySet_" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.#ctor(Lucene.Net.Util.LuceneVersion,Lucene.Net.Analysis.TokenStream,Lucene.Net.Analysis.Miscellaneous.WordDelimiterFlags,Lucene.Net.Analysis.Util.CharArraySet)">WordDelimiterFilter(LuceneVersion, TokenStream, WordDelimiterFlags, CharArraySet)</h4>
<div class="markdown level1 summary"><p>Creates a new WordDelimiterFilter using <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterIterator.html#Lucene_Net_Analysis_Miscellaneous_WordDelimiterIterator_DEFAULT_WORD_DELIM_TABLE">DEFAULT_WORD_DELIM_TABLE</a>
as its charTypeTable</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public WordDelimiterFilter(LuceneVersion matchVersion, TokenStream in, WordDelimiterFlags configurationFlags, CharArraySet protWords)</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.LuceneVersion</span></td>
<td><span class="parametername">matchVersion</span></td>
<td><p>lucene compatibility version </p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Analysis.TokenStream</span></td>
<td><span class="parametername">in</span></td>
<td><p><span class="xref">Lucene.Net.Analysis.TokenStream</span> to be filtered </p>
</td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFlags.html">WordDelimiterFlags</a></td>
<td><span class="parametername">configurationFlags</span></td>
<td><p>Flags configuring the filter </p>
</td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Analysis.Util.CharArraySet.html">CharArraySet</a></td>
<td><span class="parametername">protWords</span></td>
<td><p>If not null is the set of tokens to protect from being delimited </p>
</td>
</tr>
</tbody>
</table>
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</span>
<a id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter__ctor_" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter__ctor_Lucene_Net_Util_LuceneVersion_Lucene_Net_Analysis_TokenStream_System_Byte___Lucene_Net_Analysis_Miscellaneous_WordDelimiterFlags_Lucene_Net_Analysis_Util_CharArraySet_" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.#ctor(Lucene.Net.Util.LuceneVersion,Lucene.Net.Analysis.TokenStream,System.Byte[],Lucene.Net.Analysis.Miscellaneous.WordDelimiterFlags,Lucene.Net.Analysis.Util.CharArraySet)">WordDelimiterFilter(LuceneVersion, TokenStream, Byte[], WordDelimiterFlags, CharArraySet)</h4>
<div class="markdown level1 summary"><p>Creates a new WordDelimiterFilter</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public WordDelimiterFilter(LuceneVersion matchVersion, TokenStream in, byte[] charTypeTable, WordDelimiterFlags configurationFlags, CharArraySet protWords)</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.LuceneVersion</span></td>
<td><span class="parametername">matchVersion</span></td>
<td><p>lucene compatibility version </p>
</td>
</tr>
<tr>
<td><span class="xref">Lucene.Net.Analysis.TokenStream</span></td>
<td><span class="parametername">in</span></td>
<td><p>TokenStream to be filtered </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Byte</span>[]</td>
<td><span class="parametername">charTypeTable</span></td>
<td><p>table containing character types </p>
</td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFlags.html">WordDelimiterFlags</a></td>
<td><span class="parametername">configurationFlags</span></td>
<td><p>Flags configuring the filter </p>
</td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Analysis.Util.CharArraySet.html">CharArraySet</a></td>
<td><span class="parametername">protWords</span></td>
<td><p>If not null is the set of tokens to protect from being delimited </p>
</td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_ALPHA" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.ALPHA">ALPHA</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 const int ALPHA = 3</code></pre>
</div>
<h5 class="fieldValue">Field Value</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_ALPHANUM" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.ALPHANUM">ALPHANUM</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 const int ALPHANUM = 7</code></pre>
</div>
<h5 class="fieldValue">Field Value</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_DIGIT" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.DIGIT">DIGIT</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 const int DIGIT = 4</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
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<td><span class="xref">System.Int32</span></td>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_LOWER" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.LOWER">LOWER</h4>
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<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public const int LOWER = 1</code></pre>
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<h5 class="fieldValue">Field Value</h5>
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<th>Type</th>
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<td><span class="xref">System.Int32</span></td>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_SUBWORD_DELIM" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.SUBWORD_DELIM">SUBWORD_DELIM</h4>
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<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public const int SUBWORD_DELIM = 8</code></pre>
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<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
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<th>Type</th>
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<td><span class="xref">System.Int32</span></td>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_UPPER" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.UPPER">UPPER</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public const int UPPER = 2</code></pre>
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<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
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<th>Type</th>
<th>Description</th>
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<td><span class="xref">System.Int32</span></td>
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<h3 id="methods">Methods
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_IncrementToken" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.IncrementToken">IncrementToken()</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">public override bool IncrementToken()</code></pre>
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<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>
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<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.TokenStream.IncrementToken()</span></div>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_WordDelimiterFilter_Reset" data-uid="Lucene.Net.Analysis.Miscellaneous.WordDelimiterFilter.Reset">Reset()</h4>
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<pre><code class="lang-csharp hljs">public override void Reset()</code></pre>
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<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.TokenFilter.Reset()</span></div>
<h3 id="implements">Implements</h3>
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