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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter">
<h1 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter" class="text-break">Class ASCIIFoldingFilter
</h1>
<div class="markdown level0 summary"><p>This class converts alphabetic, numeric, and symbolic Unicode characters
which are not in the first 127 ASCII characters (the &quot;Basic Latin&quot; Unicode
block) into their ASCII equivalents, if one exists.
<p>
Characters from the following Unicode blocks are converted; however, only
those characters with reasonable ASCII alternatives are converted:</p>
<p><ul>
<item>C1 Controls and Latin-1 Supplement: <a href="http://www.unicode.org/charts/PDF/U0080.pdf">http://www.unicode.org/charts/PDF/U0080.pdf</a></item>
<item>Latin Extended-A: <a href="http://www.unicode.org/charts/PDF/U0100.pdf">http://www.unicode.org/charts/PDF/U0100.pdf</a></item>
<item>Latin Extended-B: <a href="http://www.unicode.org/charts/PDF/U0180.pdf">http://www.unicode.org/charts/PDF/U0180.pdf</a></item>
<item>Latin Extended Additional: <a href="http://www.unicode.org/charts/PDF/U1E00.pdf">http://www.unicode.org/charts/PDF/U1E00.pdf</a></item>
<item>Latin Extended-C: <a href="http://www.unicode.org/charts/PDF/U2C60.pdf">http://www.unicode.org/charts/PDF/U2C60.pdf</a></item>
<item>Latin Extended-D: <a href="http://www.unicode.org/charts/PDF/UA720.pdf">http://www.unicode.org/charts/PDF/UA720.pdf</a></item>
<item>IPA Extensions: <a href="http://www.unicode.org/charts/PDF/U0250.pdf">http://www.unicode.org/charts/PDF/U0250.pdf</a></item>
<item>Phonetic Extensions: <a href="http://www.unicode.org/charts/PDF/U1D00.pdf">http://www.unicode.org/charts/PDF/U1D00.pdf</a></item>
<item>Phonetic Extensions Supplement: <a href="http://www.unicode.org/charts/PDF/U1D80.pdf">http://www.unicode.org/charts/PDF/U1D80.pdf</a></item>
<item>General Punctuation: <a href="http://www.unicode.org/charts/PDF/U2000.pdf">http://www.unicode.org/charts/PDF/U2000.pdf</a></item>
<item>Superscripts and Subscripts: <a href="http://www.unicode.org/charts/PDF/U2070.pdf">http://www.unicode.org/charts/PDF/U2070.pdf</a></item>
<item>Enclosed Alphanumerics: <a href="http://www.unicode.org/charts/PDF/U2460.pdf">http://www.unicode.org/charts/PDF/U2460.pdf</a></item>
<item>Dingbats: <a href="http://www.unicode.org/charts/PDF/U2700.pdf">http://www.unicode.org/charts/PDF/U2700.pdf</a></item>
<item>Supplemental Punctuation: <a href="http://www.unicode.org/charts/PDF/U2E00.pdf">http://www.unicode.org/charts/PDF/U2E00.pdf</a></item>
<item>Alphabetic Presentation Forms: <a href="http://www.unicode.org/charts/PDF/UFB00.pdf">http://www.unicode.org/charts/PDF/UFB00.pdf</a></item>
<item>Halfwidth and Fullwidth Forms: <a href="http://www.unicode.org/charts/PDF/UFF00.pdf">http://www.unicode.org/charts/PDF/UFF00.pdf</a></item>
</ul>
<p>
See: <a href="http://en.wikipedia.org/wiki/Latin_characters_in_Unicode">http://en.wikipedia.org/wiki/Latin_characters_in_Unicode</a>
<p>
For example, &apos;&amp;agrave;&apos; will be replaced by &apos;a&apos;.</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">ASCIIFoldingFilter</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>
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<div>
<span class="xref">Lucene.Net.Util.AttributeSource.GetAttributeImplsEnumerator()</span>
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<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>
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<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>
<div>
<span class="xref">System.Object.GetType()</span>
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<span class="xref">System.Object.MemberwiseClone()</span>
</div>
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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_ASCIIFoldingFilter_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public sealed class ASCIIFoldingFilter : TokenFilter, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter__ctor_Lucene_Net_Analysis_TokenStream_.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.%23ctor(Lucene.Net.Analysis.TokenStream)%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_ASCIIFoldingFilter__ctor_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter__ctor_Lucene_Net_Analysis_TokenStream_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.#ctor(Lucene.Net.Analysis.TokenStream)">ASCIIFoldingFilter(TokenStream)</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 ASCIIFoldingFilter(TokenStream input)</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.Analysis.TokenStream</span></td>
<td><span class="parametername">input</span></td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter__ctor_Lucene_Net_Analysis_TokenStream_System_Boolean_.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.%23ctor(Lucene.Net.Analysis.TokenStream%2CSystem.Boolean)%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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</span>
<a id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter__ctor_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter__ctor_Lucene_Net_Analysis_TokenStream_System_Boolean_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.#ctor(Lucene.Net.Analysis.TokenStream,System.Boolean)">ASCIIFoldingFilter(TokenStream, Boolean)</h4>
<div class="markdown level1 summary"><p>Create a new <a class="xref" href="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.html">ASCIIFoldingFilter</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ASCIIFoldingFilter(TokenStream input, bool preserveOriginal)</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.Analysis.TokenStream</span></td>
<td><span class="parametername">input</span></td>
<td><p>TokenStream to filter </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">preserveOriginal</span></td>
<td><p>should the original tokens be kept on the input stream with a 0 position increment
from the folded tokens?</p>
</td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_PreserveOriginal.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.PreserveOriginal%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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<span class="small pull-right mobile-hide">
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</span>
<a id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_PreserveOriginal_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.PreserveOriginal*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_PreserveOriginal" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.PreserveOriginal">PreserveOriginal</h4>
<div class="markdown level1 summary"><p>Does the filter preserve the original tokens?</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public bool PreserveOriginal { get; }</code></pre>
</div>
<h5 class="propertyValue">Property 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.Boolean</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_FoldToASCII_System_Char___System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII(System.Char%5B%5D%2CSystem.Int32)%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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</span>
<a id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_FoldToASCII_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_FoldToASCII_System_Char___System_Int32_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII(System.Char[],System.Int32)">FoldToASCII(Char[], Int32)</h4>
<div class="markdown level1 summary"><p>Converts characters above ASCII to their ASCII equivalents. For example,
accents are removed from accented characters. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public void FoldToASCII(char[] input, int length)</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.Char</span>[]</td>
<td><span class="parametername">input</span></td>
<td><p>The string to fold </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">length</span></td>
<td><p>The number of characters in the input string </p>
</td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_FoldToASCII_System_Char___System_Int32_System_Char___System_Int32_System_Int32_.md&amp;value=---%0Auid%3A%20Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII(System.Char%5B%5D%2CSystem.Int32%2CSystem.Char%5B%5D%2CSystem.Int32%2CSystem.Int32)%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_ASCIIFoldingFilter_FoldToASCII_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII*"></a>
<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_FoldToASCII_System_Char___System_Int32_System_Char___System_Int32_System_Int32_" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.FoldToASCII(System.Char[],System.Int32,System.Char[],System.Int32,System.Int32)">FoldToASCII(Char[], Int32, Char[], Int32, Int32)</h4>
<div class="markdown level1 summary"><p>Converts characters above ASCII to their ASCII equivalents. For example,
accents are removed from accented characters.
<p>
<div class="lucene-block lucene-internal">This is a Lucene.NET INTERNAL API, use at your own risk</div></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static int FoldToASCII(char[] input, int inputPos, char[] output, int outputPos, int length)</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.Char</span>[]</td>
<td><span class="parametername">input</span></td>
<td><p>The characters to fold </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">inputPos</span></td>
<td><p>Index of the first character to fold </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Char</span>[]</td>
<td><span class="parametername">output</span></td>
<td><p>The result of the folding. Should be of size &gt;= <code>length * 4</code>. </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">outputPos</span></td>
<td><p>Index of output where to put the result of the folding </p>
</td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">length</span></td>
<td><p>The number of characters to fold </p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
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<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
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<td><span class="xref">System.Int32</span></td>
<td><p>length of output </p>
</td>
</tr>
</tbody>
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<h4 id="Lucene_Net_Analysis_Miscellaneous_ASCIIFoldingFilter_IncrementToken" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.IncrementToken">IncrementToken()</h4>
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<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<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>
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<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_ASCIIFoldingFilter_Reset" data-uid="Lucene.Net.Analysis.Miscellaneous.ASCIIFoldingFilter.Reset">Reset()</h4>
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<h5 class="decalaration">Declaration</h5>
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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>
<div>
<span class="xref">System.IDisposable</span>
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