Is there a CF7 extension for IBAN form?

Hi!
For a CF7 Form I need a input field where people type in their IBAN (International Bank Account Number). It has 22 characters (2 strings and 20 numbers). They are divided by blanks into 5 groups of 4 characters and 2 characters at the end.
I know that I need Javascript for the form, if I want to do all of the following:
– add automatical blanks after 4 characters while the user types them in
– limit the number of characters to 22
– add a field validation to check if the 2 strings and the 20 numbers are at the right place
– print the result for the website owner with the added blanks

Does anybody know if there is an extension plugin for this? IBAN is used all over Europe, still I couldn’t find anything on the net yet.

THANKS!