Format Text Field (text mask)

[Kiwi]

Hi all,

I'm trying to add a text mask to a PDF text field where the user is limited to enter only a uppercase character followed by two numbers a dash and then 5 numbers i.e. A12-34567
I can't find any information about putting in a text mask, I tried the Acrobat version A99-99999 but that only gives me errors in the PDF viewer.
I found information how to check the input after the user has put in the text, but i want to check during the users input
Is there a URL which explains how to do this, or can somebody explain how to do this.

Many thanks



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