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<article class="content wrap" id="_content" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter">
<h1 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter" class="text-break">Class PatternReplaceCharFilter
</h1>
<div class="markdown level0 summary"><p><span class="xref">Lucene.Net.Analysis.CharFilter</span> that uses a regular expression for the target of replace string.
The pattern match will be done in each &quot;block&quot; in char stream.</p>
<p>
ex1) source=&quot;aa bb aa bb&quot;, pattern=&quot;(aa)\s+(bb)&quot; replacement=&quot;$1#$2&quot;
output=&quot;aa#bb aa#bb&quot;
</p>
<p>NOTE: If you produce a phrase that has different length to source string
and the field is used for highlighting for a term of the phrase, you will
face a trouble.</p>
<p>
ex2) source=&quot;aa123bb&quot;, pattern=&quot;(aa)\d+(bb)&quot; replacement=&quot;$1 $2&quot;
output=&quot;aa bb&quot;
and you want to search bb and highlight it, you will get
highlight snippet=&quot;aa1&lt;em&gt;23bb&lt;/em&gt;&quot;
</p>
<p>@since Solr 1.5</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">System.MarshalByRefObject</span></div>
<div class="level2"><span class="xref">System.IO.TextReader</span></div>
<div class="level3"><span class="xref">Lucene.Net.Analysis.CharFilter</span></div>
<div class="level4"><a class="xref" href="Lucene.Net.Analysis.CharFilters.BaseCharFilter.html">BaseCharFilter</a></div>
<div class="level5"><span class="xref">PatternReplaceCharFilter</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>
<a class="xref" href="Lucene.Net.Analysis.CharFilters.BaseCharFilter.html#Lucene_Net_Analysis_CharFilters_BaseCharFilter_LastCumulativeDiff">BaseCharFilter.LastCumulativeDiff</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Analysis.CharFilters.BaseCharFilter.html#Lucene_Net_Analysis_CharFilters_BaseCharFilter_AddOffCorrectMap_System_Int32_System_Int32_">BaseCharFilter.AddOffCorrectMap(Int32, Int32)</a>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.CharFilter.m_input</span>
</div>
<div>
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.CharFilter.html#Lucene_Net_Analysis_CharFilter_Dispose_System_Boolean_">CharFilter.Dispose(Boolean)</a>
</div>
<div>
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.CharFilter.html#Lucene_Net_Analysis_CharFilter_CorrectOffset_System_Int32_">CharFilter.CorrectOffset(Int32)</a>
</div>
<div>
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.CharFilter.html#Lucene_Net_Analysis_CharFilter_Skip_System_Int32_">CharFilter.Skip(Int32)</a>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.CharFilter.Reset()</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.CharFilter.IsReady</span>
</div>
<div>
<span class="xref">Lucene.Net.Analysis.CharFilter.IsMarkSupported</span>
</div>
<div>
<a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.CharFilter.html#Lucene_Net_Analysis_CharFilter_Mark_System_Int32_">CharFilter.Mark(Int32)</a>
</div>
<div>
<span class="xref">System.IO.TextReader.Null</span>
</div>
<div>
<span class="xref">System.IO.TextReader.Close()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.Dispose()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.Peek()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadAsync(System.Char[], System.Int32, System.Int32)</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadBlock(System.Char[], System.Int32, System.Int32)</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadBlockAsync(System.Char[], System.Int32, System.Int32)</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadLine()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadLineAsync()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadToEnd()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.ReadToEndAsync()</span>
</div>
<div>
<span class="xref">System.IO.TextReader.Synchronized(System.IO.TextReader)</span>
</div>
<div>
<span class="xref">System.MarshalByRefObject.GetLifetimeService()</span>
</div>
<div>
<span class="xref">System.MarshalByRefObject.InitializeLifetimeService()</span>
</div>
<div>
<span class="xref">System.MarshalByRefObject.MemberwiseClone(System.Boolean)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</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_PatternReplaceCharFilter_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class PatternReplaceCharFilter : BaseCharFilter, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
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<a id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter__ctor_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter__ctor_System_Text_RegularExpressions_Regex_System_String_System_Int32_System_String_System_IO_TextReader_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.#ctor(System.Text.RegularExpressions.Regex,System.String,System.Int32,System.String,System.IO.TextReader)">PatternReplaceCharFilter(Regex, String, Int32, String, TextReader)</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">[Obsolete]
public PatternReplaceCharFilter(Regex pattern, string replacement, int maxBlockChars, string blockDelimiter, TextReader in)</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.Text.RegularExpressions.Regex</span></td>
<td><span class="parametername">pattern</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">replacement</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">maxBlockChars</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">blockDelimiter</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">in</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter__ctor_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.#ctor*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter__ctor_System_Text_RegularExpressions_Regex_System_String_System_IO_TextReader_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.#ctor(System.Text.RegularExpressions.Regex,System.String,System.IO.TextReader)">PatternReplaceCharFilter(Regex, String, TextReader)</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 PatternReplaceCharFilter(Regex pattern, string replacement, TextReader in)</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.Text.RegularExpressions.Regex</span></td>
<td><span class="parametername">pattern</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">replacement</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.IO.TextReader</span></td>
<td><span class="parametername">in</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
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<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_DEFAULT_MAX_BLOCK_CHARS" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.DEFAULT_MAX_BLOCK_CHARS">DEFAULT_MAX_BLOCK_CHARS</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">[Obsolete]
public const int DEFAULT_MAX_BLOCK_CHARS = 10000</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>
<h3 id="methods">Methods
</h3>
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<a id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_Correct_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.Correct*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_Correct_System_Int32_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.Correct(System.Int32)">Correct(Int32)</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">protected override int Correct(int currentOff)</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.Int32</span></td>
<td><span class="parametername">currentOff</span></td>
<td></td>
</tr>
</tbody>
</table>
<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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Analysis.CharFilters.BaseCharFilter.html#Lucene_Net_Analysis_CharFilters_BaseCharFilter_Correct_System_Int32_">BaseCharFilter.Correct(Int32)</a></div>
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<a id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_Read_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.Read*"></a>
<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_Read" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.Read">Read()</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 int Read()</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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><span class="xref">Lucene.Net.Analysis.CharFilter.Read()</span></div>
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<h4 id="Lucene_Net_Analysis_Pattern_PatternReplaceCharFilter_Read_System_Char___System_Int32_System_Int32_" data-uid="Lucene.Net.Analysis.Pattern.PatternReplaceCharFilter.Read(System.Char[],System.Int32,System.Int32)">Read(Char[], Int32, Int32)</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 int Read(char[] cbuf, int off, int len)</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">cbuf</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">off</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Int32</span></td>
<td><span class="parametername">len</span></td>
<td></td>
</tr>
</tbody>
</table>
<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.Int32</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="http://localhost:8080/api/core/Lucene.Net.Analysis.CharFilter.html#Lucene_Net_Analysis_CharFilter_Read_System_Char___System_Int32_System_Int32_">CharFilter.Read(Char[], Int32, Int32)</a></div>
<h3 id="implements">Implements</h3>
<div>
<span class="xref">System.IDisposable</span>
</div>
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