InfoPath Dev

Jimmy - you rock. I thought there would be a way to do this in a formula, but could not, for the life of me, figure it out. That is a very elegant solution! Thanks for chiming in!

 Hilary, I am still on version 3.4 and will try your solution when I upgrade to 4.2 or greater.

 Jimmy, I replaced the existing condition with that of yours. It works great!

Thank you both!

I have a business user who would like to do string validation on a text box in an InfoPath form. And, the validation requirements are more complex than I can understand being a newbie at this. I was thinking about using some sort of a template or format. Anybody have any ideas?
DSN FIELD: Validation rules:               
DSN cannot be longer than 44 characters- This is easy

If possible:
Character 1 must be ‘P’  ‘A’  or  ‘Q’
Characters 6 thru 8 must be ‘SPM’
Character 9 must be a ‘.’
Characters 14 thru 16 must be numeric
Character 17 must be an ‘S’