How do I set the validation pattern to accept both a letter or a number for a certain value?

[nicolem28858303]

I am trying to set up a validation for a VIN which doesn't have a set format of letters and numbers. Is there a way to set the validation so that a letter or number is acceptable ? I also want it to space out (so instead of  5555555 its 5 5 5 5 5 5) in the design pattern?

Sorry if this is a dumb question, I just started using the software today.