Another option is to use the RadInputManager and its RegExpTextBoxSetting to configure an ordinary textbox to accept only specific type of input. Other than that we do not have a specific input control that limits input values in such way.
Another common client-side approach for validating is to handle the form's onsubmit event and add there validation logic which will prevent the form from submitting if the input is incorrect.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!