How do I allow multiple formats in a required field?

Hi,   

In this case I am trying to validate a zip code field to allow U.S., Canada, and UK zip codes.  How would I do this?  I tried using the attached image, but it gives me an error when I enter a nine-digit U.S. zip code, like 12345-6789.  I want the field to be able to accept the four different zip code formats below.  Thank you for your help.