RegexStringValidator Class

Note: This class is new in the .NET Framework version 2.0.

Provides validation of a string based on the rules provided by a regular expression.

Namespace: System.Configuration
Assembly: System.Configuration (in system.configuration.dll)

public class RegexStringValidator : ConfigurationValidatorBase
public class RegexStringValidator extends ConfigurationValidatorBase
public class RegexStringValidator extends ConfigurationValidatorBase

The RegexStringValidator contains the rules necessary to validate a string object based on a regular expression. The rules are established when the RegexStringValidator is instantiated.

The CanValidate method determines whether the object type being validated matches the expected type. The object being validated is passed as a parameter of the Validate method.

The following code example demonstrates how to use the RegexStringValidator type.

using System;
using System.Configuration;

namespace Microsoft.Samples.AspNet.Validators
  class UsingRegexStringValidator
    static void Main(string[] args)
      // Display title.
      Console.WriteLine("ASP.NET Validators");

      // Create RegexString and Validator.
      string testString = "";
      string regexString = 
      RegexStringValidator myRegexValidator = 
       new RegexStringValidator(regexString);

      // Determine if the object to validate can be validated.
      Console.WriteLine("CanValidate: {0",

        // Attempt validation.
      catch (ArgumentException e)
        // Validation failed.
        Console.WriteLine("Error: {0", e.Message.ToString());

      // Display and wait


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

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

Community Additions