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RegularExpressionAttribute Class

Specifies that a data field value in ASP.NET Dynamic Data must match the specified regular expression.

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.ValidationAttribute
      System.ComponentModel.DataAnnotations.RegularExpressionAttribute

Namespace:  System.ComponentModel.DataAnnotations
Assembly:  System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)
[AttributeUsageAttribute(AttributeTargets.Property|AttributeTargets.Field|AttributeTargets.Parameter, AllowMultiple = false)]
public class RegularExpressionAttribute : ValidationAttribute

The RegularExpressionAttribute type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsRegularExpressionAttributeInitializes a new instance of the RegularExpressionAttribute class.
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  NameDescription
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsErrorMessageGets or sets an error message to associate with a validation control if validation fails. (Inherited from ValidationAttribute.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsErrorMessageResourceNameGets or sets the error message resource name to use in order to look up the ErrorMessageResourceType property value if validation fails. (Inherited from ValidationAttribute.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsErrorMessageResourceTypeGets or sets the resource type to use for error-message lookup if validation fails. (Inherited from ValidationAttribute.)
Protected propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsErrorMessageStringGets the localized validation error message. (Inherited from ValidationAttribute.)
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsPatternGets the regular expression pattern.
Public propertyRequiresValidationContextGets a value that indicates whether the attribute requires validation context. (Inherited from ValidationAttribute.)
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFormatErrorMessageFormats the error message to display if the regular expression validation fails. (Overrides ValidationAttribute.FormatErrorMessage(String).)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetValidationResultChecks whether the specified value is valid with respect to the current validation attribute. (Inherited from ValidationAttribute.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodIsValid(Object)Checks whether the value entered by the user matches the regular expression pattern. (Overrides ValidationAttribute.IsValid(Object).)
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsIsValid(Object, ValidationContext)Validates the specified value with respect to the current validation attribute. (Inherited from ValidationAttribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsValidate(Object, ValidationContext)Validates the specified object. (Inherited from ValidationAttribute.)
Public methodValidate(Object, String)Validates the specified object. (Inherited from ValidationAttribute.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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You apply the RegularExpressionAttribute attribute to a property when you need to validate values for the property against a regular expression. The regular expression enables you to specify very precisely the format of valid values. The Pattern property contains the regular expression.If the value of the property is null or an empty string (""), the value automatically passes validation for the RegularExpressionAttribute attribute. To validate that the value is not null or an empty string, use the RequiredAttribute attribute.

The following example shows how to use the RegularExpressionAttribute attribute to validate the FirstName and LastName data fields. The regular expression allows up to 40 uppercase and lowercase characters. The example performs the following tasks:

  • Implements a metadata partial class and the associated metadata class.

  • In the associated metadata class, applies the RegularExpressionAttribute attribute to the FirstName and LastName data fields, specifying the pattern and custom error messages.

using System;
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;


[MetadataType(typeof(CustomerMetaData))]
public partial class Customer
{


}

public class CustomerMetaData
{

    // Allow up to 40 uppercase and lowercase  
    // characters. Use custom error.
    [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$", 
         ErrorMessage = "Characters are not allowed.")]
    public object FirstName;

    // Allow up to 40 uppercase and lowercase  
    // characters. Use standard error.
    [RegularExpression(@"^[a-zA-Z''-'\s]{1,40}$")]
    public object LastName;
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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