ASP.NET 4 Unleashed

Using the RegularExpressionValidator Control

The RegularExpressionValidator control enables you to compare the value of a form field against a regular expression. You can use a regular expression to represent string patterns such as email addresses, Social Security numbers, phone numbers, dates, currency amounts, and product codes.

For example, the page in Listing 3.13 enables you to validate an email address (see Figure 3.11).

Figure 3.11. Validating an email address.

Listing 3.13. ShowRegularExpressionValidator.aspx

The regular expression ...