ASP.NET in a Nutshell

Name

RegularExpressionValidator

Synopsis

The RegularExpressionValidator is a type of validation control that compares an input control against a pattern specified in the ValidationExpression. Regular expression validation is ideally suited for verifying predictable sequences of characters, such as those in social security numbers, email addresses, telephone numbers, and postal codes. Validation will succeed if the input control is empty, unless you also use a RequiredFieldValidator control.

Validation is always performed on the server. If the client browser supports JavaScript, validation will be performed there as well, which can save a roundtrip if errors are present. The regular expression validation performed by the JavaScript code is a subset of the full System.Text.RegularExpressions.Regex syntax.

Public Class RegularExpressionValidator : Inherits BaseValidator
' Public Constructors
   Public Sub New() 
' Public Instance Properties
   Public Property ValidationExpression As String  
' Protected Instance Methods
   Overrides Protected Sub AddAttributesToRender(
        ByVal writer As System.Web.UI.HtmlTextWriter) 
   Overrides Protected Function EvaluateIsValid() As Boolean  
End Class

Hierarchy

System.Object→ System.Web.UI.Control(System.ComponentModel.IComponent, System.IDisposable, System.Web.UI.IParserAccessor, System.Web.UI.IDataBindingsAccessor)→WebControl(System.Web.UI.IAttributeAccessor)→Label→BaseValidator(System.Web.UI.IValidator)→ RegularExpressionValidator