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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.
C# RegExValidator1.aspx
For a detailed discussion of Web Forms validation, please see the Validating Form Input Controls section of this QuickStart tutorial.
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