RegularExpressionValidator Class
Assembly: System.Web (in system.web.dll)
The RegularExpressionValidator control checks whether the value of an input control 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 e-mail addresses, telephone numbers, and postal codes.
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| Validation succeeds if the input control is empty. If a value is required for the associated input control, use a RequiredFieldValidator control in addition to the RegularExpressionValidator control. |
Both server-side and client-side validation are performed unless the browser does not support client-side validation or client-side validation is explicitly disabled (by setting the EnableClientScript property to false).
The regular-expression validation implementation is slightly different on the client than on the server. On the client, JScript regular-expression syntax is used. On the server, System.Text.RegularExpressions.Regex syntax is used. Since JScript regular expression syntax is a subset of System.Text.RegularExpressions.Regex syntax, it is recommended that JScript regular-expression syntax be used in order to yield the same results on both the client and the server.
For additional information on validation controls, see BaseValidator. For more information on regular expressions, see .NET Framework Regular Expressions.
Accessibility
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
- AspNetHostingPermission for operating in a hosted environment. Demand value: LinkDemand. Permission value: Minimal.
- AspNetHostingPermission for operating in a hosted environment. Demand value: InheritanceDemand. Permission value: Minimal.
System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.Label
System.Web.UI.WebControls.BaseValidator
System.Web.UI.WebControls.RegularExpressionValidator
Windows 98, Windows 2000 SP4, 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.
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