In this tutorial you will see how to perform mask validation using the Struts Validation Framework.
In this example you will see how to use the mask rule to restrict the user input. Here the userForm has two fields, one for the user name and the other for the phone number. We will restrict the user to enter only alphabets in the user name field and only numbers in the phone number field. The struts-config.xml file has the following entry for userForm.