Need to exclude specific characters from being entered

I have created a form where I have a question called "Postal Code". 

I have applied an input mask of "@#@ #@#". Good so far.

However, Postal Codes can not include the letters D, F, I, O, Q or U.

And the first position does not make use of the letters W or Z.  

Is there a way I can prevent someone from entering these letters?

Thanks,

Peter

Hello Peter, 

I can suggest to apply some conditional logic to check the input. 

For example, you can add a text element to the form to indicate an error:

Then, a condition can check the input this way:

Condition could hide Submit button at same time, so a user could not submit a form with incorrect value.

Hope this helps! But, please get back to us if you need further assistance. 

That is absolutely awesome Victoria!

Thanks so much for the quick response!

Peter