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.  Some common regular expressions are:

• US Zip Codes:  \d{5}
• US Phone Numbers:  \d{3}-\d{3}-\d{4}
• Email address:  \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

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

Whitepapers/Blogs

• RegularExpressionValidator MSDN reference
• Dot Net framework Regular expression