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.
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