Q:

Flex: Restrict data input

I have a TextField as:
 <s:TextInput restrict="A-Z0-9_" maxChars="30"/>

And I am restricting the input to:

Capital letters
Numbers
_
no spaces
max chars 30

How can I restrict the input more to allow only letters at the begging and end?

A:

The restrict-field validates immediately when the user types in something.
You need an RegExp-Validator to validate after the user wants to submit the data, so you can't use the restrict-field.

