RegexStringValidator Class

Definition

Namespace:

System.Configuration

Assembly:

System.Configuration.ConfigurationManager.dll

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

public ref class RegexStringValidator : System::Configuration::ConfigurationValidatorBase

public class RegexStringValidator : System.Configuration.ConfigurationValidatorBase

type RegexStringValidator = class
    inherit ConfigurationValidatorBase

Public Class RegexStringValidator
Inherits ConfigurationValidatorBase

Inheritance

Object

ConfigurationValidatorBase

RegexStringValidator

Examples

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");
      Console.WriteLine();

      // Create RegexString and Validator.
      string testString = "someone@example.com";
      string regexString = 
       @"^[a-zA-Z\.\-_]+@([a-zA-Z\.\-_]+\.)+[a-zA-Z]{2,4}$";
      RegexStringValidator myRegexValidator = 
       new RegexStringValidator(regexString);

      // Determine if the object to validate can be validated.
      Console.WriteLine("CanValidate: {0}",
        myRegexValidator.CanValidate(testString.GetType()));

      try
      {
        // Attempt validation.
        myRegexValidator.Validate(testString);
        Console.WriteLine("Validated.");
      }
      catch (ArgumentException e)
      {
        // Validation failed.
        Console.WriteLine("Error: {0}", e.Message.ToString());
      }

      // Display and wait
      Console.ReadLine();
    }
  }
}

Imports System.Configuration

Namespace Microsoft.Samples.AspNet.Validators
  Class UsingRegexStringValidator
    Public Shared Sub Main()

      ' Display title.
      Console.WriteLine("ASP.NET Validators")
      Console.WriteLine()

      ' Create RegexString and Validator.
      Dim testString As String = "someone@example.com"
      Dim regexString As String = _
       "^[a-zA-Z\.\-_]+@([a-zA-Z\.\-_]+\.)+[a-zA-Z]{2,4}$"
      Dim myRegexValidator As RegexStringValidator = _ 
       New RegexStringValidator(regexString)

      ' Determine if the object to validate can be validated.
      Console.WriteLine("CanValidate: {0}", _
        myRegexValidator.CanValidate(testString.GetType()))

      Try
        ' Attempt validation.
        myRegexValidator.Validate(testString)
        Console.WriteLine("Validated.")

      Catch e As Exception
        ' Validation failed.
        Console.WriteLine("Error: {0}", e.Message.ToString())
      End Try

      ' Display and wait.
      Console.ReadLine()
    End Sub
  End Class
End Namespace

Remarks

The RegexStringValidator object contains the rules necessary to validate a string object based on a regular expression. The rules are established when an instance of this class is created.

The CanValidate method determines whether the object type being validated matches the expected type. The object to validate is passed as an argument to the Validate method.

Constructors

RegexStringValidator(String)

Initializes a new instance of the RegexStringValidator class.

Methods

CanValidate(Type)	Determines whether the type of the object can be validated.
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)
Validate(Object)	Validates a string based on the rules provided by a regular expression.

See also

• ConfigurationValidatorBase