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Regex.xml
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<Type Name="Regex" FullName="System.Text.RegularExpressions.Regex">
<TypeSignature Language="C#" Value="public class Regex" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit Regex extends System.Object" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="DocId" Value="T:System.Text.RegularExpressions.Regex" />
<TypeSignature Language="VB.NET" Value="Public Class Regex" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="F#" Value="type Regex = class" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="C++ CLI" Value="public ref class Regex" FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;netstandard-1.0;netstandard-1.1;netstandard-1.2;netstandard-1.3;netstandard-1.4;netstandard-1.6" />
<TypeSignature Language="C#" Value="public class Regex : System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit Regex extends System.Object implements class System.Runtime.Serialization.ISerializable" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netstandard-2.0;netstandard-2.1" />
<TypeSignature Language="VB.NET" Value="Public Class Regex
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<AssemblyInfo>
<AssemblyName>System.Text.RegularExpressions</AssemblyName>
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</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1">
<InterfaceName>System.Runtime.Serialization.ISerializable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Serializable]</AttributeName>
<AttributeName Language="F#">[<System.Serializable>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents an immutable regular expression.</summary>
<remarks>For more information about this API, see <see href="/dotnet/fundamentals/runtime-libraries/system-text-regularexpressions-regex">Supplemental API remarks for Regex</see>.</remarks>
<threadsafe>The <see cref="T:System.Text.RegularExpressions.Regex" /> class is immutable (read-only) and thread safe. <see cref="T:System.Text.RegularExpressions.Regex" /> objects can be created on any thread and shared between threads. For more information, see <see href="/dotnet/standard/base-types/thread-safety-in-regular-expressions">Thread Safety</see>.</threadsafe>
<altmember cref="T:System.Configuration.RegexStringValidator" />
<related type="Article" href="/dotnet/standard/base-types/regular-expressions">.NET Regular Expressions</related>
<related type="Article" href="/dotnet/standard/base-types/regular-expression-language-quick-reference">Regular Expression Language Elements</related>
<related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular%20expressions%20quick%20reference.docx">Regular Expressions - Quick Reference (download in Word format)</related>
<related type="ExternalDocumentation" href="https://download.microsoft.com/download/D/2/4/D240EBF6-A9BA-4E4F-A63F-AEB6DA0B921C/Regular%20expressions%20quick%20reference.pdf">Regular Expressions - Quick Reference (download in PDF format)</related>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
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<AssemblyName>System.Text.RegularExpressions</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.10.0</AssemblyVersion>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.1.1.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Text.RegularExpressions.Regex" /> class.</summary>
<related type="Article" href="/dotnet/standard/base-types/regular-expression-language-quick-reference">Regular Expression Language Elements</related>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected Regex ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Text.RegularExpressions.Regex.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 Regex();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Text.RegularExpressions</AssemblyName>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
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<AssemblyVersion>9.0.0.0</AssemblyVersion>
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<AssemblyName>System</AssemblyName>
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<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Text.RegularExpressions.Regex" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Note that this constructor is protected; it can only be called by classes derived from the <xref:System.Text.RegularExpressions.Regex> class.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public Regex (string pattern);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(string pattern) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Text.RegularExpressions.Regex.#ctor(System.String)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (pattern As String)" />
<MemberSignature Language="F#" Value="new System.Text.RegularExpressions.Regex : string -> System.Text.RegularExpressions.Regex" Usage="new System.Text.RegularExpressions.Regex pattern" />
<MemberSignature Language="C++ CLI" Value="public:
 Regex(System::String ^ pattern);" />
<MemberType>Constructor</MemberType>
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<AssemblyName>System.Text.RegularExpressions</AssemblyName>
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<param name="pattern">The regular expression pattern to match.</param>
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<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!WARNING]
> When using <xref:System.Text.RegularExpressions> to process untrusted input, pass a [time-out value](/dotnet/standard/base-types/best-practices-regex#use-time-out-values) to prevent malicious users from causing a [denial-of-service attack](https://www.cisa.gov/news-events/news/understanding-denial-service-attacks). A time-out value specifies how long a pattern-matching method should try to find a match before it times out.
The `pattern` parameter consists of regular expression language elements that symbolically describe the string to match. For more information about regular expressions, see the [.NET Regular Expressions](/dotnet/standard/base-types/regular-expressions) and [Regular Expression Language - Quick Reference](/dotnet/standard/base-types/regular-expression-language-quick-reference) topics.
Calling the <xref:System.Text.RegularExpressions.Regex.%23ctor(System.String)> constructor is equivalent to calling the <xref:System.Text.RegularExpressions.Regex.%23ctor(System.String,System.Text.RegularExpressions.RegexOptions)> constructor with a value of <xref:System.Text.RegularExpressions.RegexOptions.None> for the `options` argument.
A <xref:System.Text.RegularExpressions.Regex> object is immutable, which means that it can be used only for the match pattern you define when you create it. However, it can be used any number of times without being recompiled.
This constructor instantiates a regular expression object that attempts a case-sensitive match of any alphabetical characters defined in `pattern`. For a case-insensitive match, use the <xref:System.Text.RegularExpressions.Regex.%23ctor(System.String,System.Text.RegularExpressions.RegexOptions)?displayProperty=nameWithType> constructor.
## Examples
The following example illustrates how to use this constructor to instantiate a regular expression that matches any word that begins with the letters "a" or "t".
:::code language="csharp" source="~/snippets/csharp/System.Text.RegularExpressions/Regex/.ctor/constructors1.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Text.RegularExpressions.Regex.Constructors/vb/constructors1.vb" id="Snippet1":::
Note that the regular expression pattern cannot match the word "The" at the beginning of the text, because comparisons are case-sensitive by default. For an example of case-insensitive comparison, see the <xref:System.Text.RegularExpressions.Regex.%23ctor(System.String,System.Text.RegularExpressions.RegexOptions)> constructor.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">A regular expression parsing error occurred.</exception>
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<para>This constructor creates a <see cref="T:System.Text.RegularExpressions.Regex" /> object that uses the default time-out value of the application domain in which it is created. If a time-out value has not been defined for the application domain, the <see cref="T:System.Text.RegularExpressions.Regex" /> object uses the value <see cref="F:System.Text.RegularExpressions.Regex.InfiniteMatchTimeout" />, which prevents the operation from timing out. The recommended constructor for creating a <see cref="T:System.Text.RegularExpressions.Regex" /> object is <see cref="M:System.Text.RegularExpressions.Regex.#ctor(System.String,System.Text.RegularExpressions.RegexOptions,System.TimeSpan)" />, which lets you set the time-out interval.</para>
</block>
<related type="Article" href="/dotnet/standard/base-types/regular-expression-language-quick-reference">Regular Expression Language Elements</related>
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<summary>Initializes a new instance of the <see cref="T:System.Text.RegularExpressions.Regex" /> class by using serialized data.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.ArgumentException">A regular expression parsing error occurred.</exception>
<exception cref="T:System.ArgumentNullException">The pattern that <paramref name="info" /> contains is <see langword="null" />.</exception>
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<param name="pattern">The regular expression pattern to match.</param>
<param name="options">A bitwise combination of the enumeration values that modify the regular expression.</param>
<summary>Initializes a new instance of the <see cref="T:System.Text.RegularExpressions.Regex" /> class for the specified regular expression, with options that modify the pattern.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
> [!WARNING]
> When using <xref:System.Text.RegularExpressions> to process untrusted input, pass a [time-out value](/dotnet/standard/base-types/best-practices-regex#use-time-out-values) to prevent malicious users from causing a [denial-of-service attack](https://www.cisa.gov/news-events/news/understanding-denial-service-attacks). A time-out value specifies how long a pattern-matching method should try to find a match before it times out.
The `pattern` parameter consists of regular expression language elements that symbolically describe the string to match. For more information about regular expressions, see the [.NET Regular Expressions](/dotnet/standard/base-types/regular-expressions) and [Regular Expression Language - Quick Reference](/dotnet/standard/base-types/regular-expression-language-quick-reference) topics.
A <xref:System.Text.RegularExpressions.Regex> object is immutable, which means that it can be used only for the match parameters you define when you create it. However, it can be used any number of times without being recompiled.
## Examples
The following example illustrates how to use this constructor to instantiate a regular expression that matches any word that begins with the letters "a" or "t".
:::code language="csharp" source="~/snippets/csharp/System.Text.RegularExpressions/Regex/.ctor/Constructors2.cs" interactive="try-dotnet" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Text.RegularExpressions.Regex.Constructors/vb/Constructors2.vb" id="Snippet2":::
Note that the match collection includes the word "The" that begins the text because the `options` parameter has defined case-insensitive comparisons.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">A regular expression parsing error occurred.</exception>
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<paramref name="options" /> contains an invalid flag.</exception>
<block subset="none" type="usage">
<para>This constructor creates a <see cref="T:System.Text.RegularExpressions.Regex" /> object that uses the default time-out value of the application domain in which it is created. If a time-out value has not been defined for the application domain, the <see cref="T:System.Text.RegularExpressions.Regex" /> object uses the value <see cref="F:System.Text.RegularExpressions.Regex.InfiniteMatchTimeout" />, which prevents the operation from timing out. The recommended constructor for creating a <see cref="T:System.Text.RegularExpressions.Regex" /> object is <see cref="M:System.Text.RegularExpressions.Regex.#ctor(System.String,System.Text.RegularExpressions.RegexOptions,System.TimeSpan)" />, which lets you set the time-out interval.</para>
</block>
<related type="Article" href="/dotnet/standard/base-types/regular-expression-language-quick-reference">Regular Expression Language Elements</related>
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<param name="pattern">The regular expression pattern to match.</param>
<param name="options">A bitwise combination of the enumeration values that modify the regular expression.</param>
<param name="matchTimeout">A time-out interval, or <see cref="F:System.Text.RegularExpressions.Regex.InfiniteMatchTimeout" /> to indicate that the method should not time out.</param>
<summary>Initializes a new instance of the <see cref="T:System.Text.RegularExpressions.Regex" /> class for the specified regular expression, with options that modify the pattern and a value that specifies how long a pattern matching method should attempt a match before it times out.</summary>
<remarks>
<format type="text/markdown">< and [Regular Expression Language - Quick Reference](/dotnet/standard/base-types/regular-expression-language-quick-reference) topics.
A <xref:System.Text.RegularExpressions.Regex> object is immutable, which means that it can be used only for the match pattern that you define when you create it. However, it can be used any number of times without being recompiled.
The `matchTimeout` parameter specifies how long a pattern-matching method should try to find a match before it times out. If no match is found in that time interval, the pattern-matching method throws a <xref:System.Text.RegularExpressions.RegexMatchTimeoutException> exception. `matchTimeout` overrides any default time-out value defined for the application domain in which the <xref:System.Text.RegularExpressions.Regex> object is created. The instance pattern-matching methods that observe the `matchTimeout` time-out interval include the following:
- <xref:System.Text.RegularExpressions.Regex.IsMatch%2A>
- <xref:System.Text.RegularExpressions.Regex.Match%2A>
- <xref:System.Text.RegularExpressions.Regex.Matches%2A>
- <xref:System.Text.RegularExpressions.Regex.Replace%2A>
- <xref:System.Text.RegularExpressions.Regex.Split%2A>
- <xref:System.Text.RegularExpressions.Match.NextMatch%2A?displayProperty=nameWithType>
Setting a time-out interval prevents regular expressions that rely on excessive backtracking from appearing to stop responding when they process input that contains near matches. For more information, see [Best Practices for Regular Expressions](/dotnet/standard/base-types/best-practices) and [Backtracking](/dotnet/standard/base-types/backtracking-in-regular-expressions). To set a reasonable time-out interval, consider the following factors:
- The length and complexity of the regular expression pattern. Longer and more complex regular expressions require more time than shorter and simpler ones.
- The expected machine load. Processing takes more time on systems that have high CPU and memory utilization.
## Examples
The following example calls the <xref:System.Text.RegularExpressions.Regex.%23ctor(System.String,System.Text.RegularExpressions.RegexOptions,System.TimeSpan)> constructor to instantiate a <xref:System.Text.RegularExpressions.Regex> object with a time-out value of one second. The regular expression pattern `(a+)+$`, which matches one or more sequences of one or more "a" characters at the end of a line, is subject to excessive backtracking. If a <xref:System.Text.RegularExpressions.RegexMatchTimeoutException> is thrown, the example increases the time-out value up to the maximum value of three seconds. Otherwise, it abandons the attempt to match the pattern.
:::code language="csharp" source="~/snippets/csharp/System.Text.RegularExpressions/Regex/.ctor/ctor1.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.text.regularexpressions.regex.ctor/vb/ctor1.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">A regular expression parsing error occurred.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="pattern" /> is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">
<paramref name="options" /> is not a valid <see cref="T:System.Text.RegularExpressions.RegexOptions" /> value.
-or-
<paramref name="matchTimeout" /> is negative, zero, or greater than approximately 24 days.</exception>
<block subset="none" type="usage">
<para>We recommend that you set the <paramref name="matchTimeout" /> parameter to an appropriate value, such as two seconds. If you disable time-outs by specifying <see cref="F:System.Text.RegularExpressions.Regex.InfiniteMatchTimeout" />, the regular expression engine offers slightly better performance. However, you should disable time-outs only under the following conditions:
- When the input processed by a regular expression is derived from a known and trusted source or consists of static text. This excludes text that has been dynamically input by users.
- When the regular expression pattern has been thoroughly tested to ensure that it efficiently handles matches, non-matches, and near matches.
- When the regular expression pattern contains no language elements that are known to cause excessive backtracking when processing a near match.</para>
</block>
<related type="Article" href="/dotnet/standard/base-types/backtracking-in-regular-expressions">Backtracking in Regular Expressions</related>
<related type="Article" href="/dotnet/standard/base-types/regular-expression-language-quick-reference">Regular Expression Language Elements</related>
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<summary>Gets or sets the maximum number of entries in the current static cache of compiled regular expressions.</summary>
<value>The maximum number of entries in the static cache.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Text.RegularExpressions.Regex> class maintains an internal cache of compiled regular expressions used in static <xref:System.Text.RegularExpressions.Regex> method calls, such as <xref:System.Text.RegularExpressions.Regex.Match%2A> or <xref:System.Text.RegularExpressions.Regex.Replace%2A>. If the value specified in a set operation is less than the current cache size, cache entries are discarded until the cache size is equal to the specified value.
By default, the cache holds 15 compiled static regular expressions. Your application typically will not have to modify the size of the cache. Use the <xref:System.Text.RegularExpressions.Regex.CacheSize%2A> property only when you want to turn off caching or when you have an unusually large cache.
]]></format>
</remarks>
<exception cref="T:System.ArgumentOutOfRangeException">The value in a set operation is less than zero.</exception>
<block subset="none" type="usage">
<para>In the .NET Framework prior to the .NET Framework 2.0 SP1, regular expressions used in both static and instance method calls were cached. Beginning with the .NET Framework 2.0 SP1, only regular expressions used in static method calls are cached.</para>
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<format type="text/markdown"><![CDATA[
## Remarks
Note that this property is protected; it can only be accessed from a class derived from the <xref:System.Text.RegularExpressions.Regex> class.
A set operation attempts to convert the value assigned to the property to a <xref:System.Collections.Hashtable> object; if this conversion fails, it calls the <xref:System.Collections.Hashtable.%23ctor(System.Collections.IDictionary)?displayProperty=nameWithType> constructor.
]]></format>
</remarks>
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<format type="text/markdown"><![CDATA[
## Remarks
Note that this property is protected; it can only be accessed from a class derived from the <xref:System.Text.RegularExpressions.Regex> class.
A set operation attempts to convert the value assigned to the property to a <xref:System.Collections.Hashtable> object; if this conversion fails, it calls the <xref:System.Collections.Hashtable.%23ctor(System.Collections.IDictionary)?displayProperty=nameWithType> constructor.
]]></format>
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<summary>Used by a <see cref="T:System.Text.RegularExpressions.Regex" /> object generated by the <see cref="Overload:System.Text.RegularExpressions.Regex.CompileToAssembly" /> method.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
> [!NOTE]
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]]></format>
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</ReturnValue>
<Parameters>
<Parameter Name="regexinfos" Type="System.Text.RegularExpressions.RegexCompilationInfo[]" Index="0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
<Parameter Name="assemblyname" Type="System.Reflection.AssemblyName" Index="1" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netcore-3.1;net-5.0;net-6.0;net-7.0;netframework-4.8.1;net-8.0;net-9.0" />
</Parameters>
<Docs>
<param name="regexinfos">An array that describes the regular expressions to compile.</param>
<param name="assemblyname">The file name of the assembly.</param>
<summary>Compiles one or more specified <see cref="T:System.Text.RegularExpressions.Regex" /> objects to a named assembly.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Text.RegularExpressions.Regex.CompileToAssembly(System.Text.RegularExpressions.RegexCompilationInfo%5B%5D,System.Reflection.AssemblyName)> method generates a .NET Framework assembly in which each regular expression defined in the `regexinfos` array is represented by a class. Typically, the <xref:System.Text.RegularExpressions.Regex.CompileToAssembly(System.Text.RegularExpressions.RegexCompilationInfo%5B%5D,System.Reflection.AssemblyName)> method is called from a separate application that generates an assembly of compiled regular expressions. Each regular expression included in the assembly has the following characteristics:
- It is derived from the <xref:System.Text.RegularExpressions.Regex> class.
- It is assigned the fully qualified name that is defined by the `fullnamespace` and `name` parameters of its corresponding <xref:System.Text.RegularExpressions.RegexCompilationInfo> object.
- It has a default (or parameterless) constructor.
Ordinarily, the code that instantiates and uses the compiled regular expression is found in an assembly or application that is separate from the code that creates the assembly.
## Examples
The following example creates an assembly named RegexLib.dll. The assembly includes two compiled regular expressions. The first, `Utilities.RegularExpressions.DuplicatedString`, matches two identical contiguous words. The second, `Utilities.RegularExpressions.EmailAddress`, checks whether a string has the correct format to be an email address.
:::code language="csharp" source="~/snippets/csharp/System.Text.RegularExpressions/Regex/CompileToAssembly/Compile1.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Text.RegularExpressions.Regex.CompileToAssembly/vb/Compile1.vb" id="Snippet1":::
The regular expression that checks a string for duplicate words is then instantiated and used by the following example.
:::code language="csharp" source="~/snippets/csharp/System.Text.RegularExpressions/Regex/CompileToAssembly/Compile2.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.Text.RegularExpressions.Regex.CompileToAssembly/vb/Compile2.vb" id="Snippet2":::
Successful compilation of this second example requires a reference to RegexLib.dll (the assembly created by the first example) to be added to the project.
]]></format>
</remarks>
<exception cref="T:System.ArgumentException">The value of the <paramref name="assemblyname" /> parameter's <see cref="P:System.Reflection.AssemblyName.Name" /> property is an empty or null string.
-or-
The regular expression pattern of one or more objects in <paramref name="regexinfos" /> contains invalid syntax.</exception>
<exception cref="T:System.ArgumentNullException">
<paramref name="assemblyname" /> or <paramref name="regexinfos" /> is <see langword="null" />.</exception>
<exception cref="T:System.PlatformNotSupportedException">.NET Core and .NET 5+ only: Creating an assembly of compiled regular expressions is not supported. </exception>
<block subset="none" type="usage">
<para>If you are developing on a system that has .NET Framework 4.5 or its point releases installed, you target .NET Framework 4, and you use the <see cref="M:System.Text.RegularExpressions.Regex.CompileToAssembly(System.Text.RegularExpressions.RegexCompilationInfo[],System.Reflection.AssemblyName)" /> method to create an assembly that contains compiled regular expressions. Trying to use one of the regular expressions in that assembly on a system that has .NET Framework 4 throws an exception. To work around this problem, you can do either of the following:
- Build the assembly that contains the compiled regular expressions on a system that has .NET Framework 4 instead of later versions installed.
- Instead of calling <see cref="M:System.Text.RegularExpressions.Regex.CompileToAssembly(System.Text.RegularExpressions.RegexCompilationInfo[],System.Reflection.AssemblyName)" /> and retrieving the compiled regular expression from an assembly, use either static or instance <see cref="T:System.Text.RegularExpressions.Regex" /> methods with the <see cref="F:System.Text.RegularExpressions.RegexOptions.Compiled" /> option when you instantiate a <see cref="T:System.Text.RegularExpressions.Regex" /> object or call a regular expression pattern matching method.</para>
</block>
<related type="Article" href="/dotnet/standard/base-types/compilation-and-reuse-in-regular-expressions">Compilation and Reuse</related>
</Docs>
</Member>
<Member MemberName="CompileToAssembly">
<MemberSignature Language="C#" Value="public static void CompileToAssembly (System.Text.RegularExpressions.RegexCompilationInfo[] regexinfos, System.Reflection.AssemblyName assemblyname, System.Reflection.Emit.CustomAttributeBuilder[]? attributes);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig void CompileToAssembly(class System.Text.RegularExpressions.RegexCompilationInfo[] regexinfos, class System.Reflection.AssemblyName assemblyname, class System.Reflection.Emit.CustomAttributeBuilder[] attributes) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Text.RegularExpressions.Regex.CompileToAssembly(System.Text.RegularExpressions.RegexCompilationInfo[],System.Reflection.AssemblyName,System.Reflection.Emit.CustomAttributeBuilder[])" />
<MemberSignature Language="VB.NET" Value="Public Shared Sub CompileToAssembly (regexinfos As RegexCompilationInfo(), assemblyname As AssemblyName, attributes As CustomAttributeBuilder())" />
<MemberSignature Language="F#" Value="static member CompileToAssembly : System.Text.RegularExpressions.RegexCompilationInfo[] * System.Reflection.AssemblyName * System.Reflection.Emit.CustomAttributeBuilder[] -> unit" Usage="System.Text.RegularExpressions.Regex.CompileToAssembly (regexinfos, assemblyname, attributes)" />
<MemberSignature Language="C++ CLI" Value="public:
 static void CompileToAssembly(cli::array <System::Text::RegularExpressions::RegexCompilationInfo ^> ^ regexinfos, System::Reflection::AssemblyName ^ assemblyname, cli::array <System::Reflection::Emit::CustomAttributeBuilder ^> ^ attributes);" />
<MemberSignature Language="C#" Value="public static void CompileToAssembly (System.Text.RegularExpressions.RegexCompilationInfo[] regexinfos, System.Reflection.AssemblyName assemblyname, System.Reflection.Emit.CustomAttributeBuilder[] attributes);" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Text.RegularExpressions</AssemblyName>
<AssemblyVersion>4.2.1.0</AssemblyVersion>