<%@ Page Language="C#" MasterPageFile="~/aspnet/section.master" %> <%@ Register TagPrefix=Acme Namespace=Acme %> <%@ Register TagPrefix="Acme" TagName="SourceRef" Src="~/util/SrcRef.ascx"%>

RegularExpressionValidator

The RegularExpressionValidator control confirms that the entry matches a pattern defined by a regular expression. This type of validation allows you to check for predictable sequences of characters, such as those in social security numbers, e-mail addresses, telephone numbers, postal codes, and so on.

RegularExpressionValidator uses two key properties to perform its validation: ControlToValidate contains the value to validate, and ValidationExpression contains the regular expression to match.

The following sample illustrates using the RegularExpressionValidator control.

For a detailed discussion of Web Forms validation, please see the Validating Form Input Controls section of this QuickStart tutorial.