Take a look at the pre-cooked Library palette of behaviors.
Methinks there's an entry in the Text section that may help you, at least
part of the way.
> In a text field i want to limit the users input to to certain
> Characters(only numbers), and Limit a field to a certain NUMBER of
> characters (maximum 6). I still want the user to be able to use enter,
> delete and backspace in the field. If the user hit anything else than the
> allowed characters i want a beep...
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