Limit formloom to postal code

I am wondering if it is possible to limit users from proceeding to a page by filling out a FormLoom form which would restrict them if their postal code does not match the postal code’s format, and first digit for Saskatchewan, Canada.

The Canadian postal codes are in the format A1A 1A1 and all SK postal codes begin with the letter S, so is there a way to preclude any postal code that does not follow the following format:

S any number any letter any number any letter any number (but without the spaces)?

This is for lottery ticket sales which are restricted in our province by the SK Liquor and Gaming authority, and purchasers who buy the tickets must live in SK.

Try this? Enter Zip Code - Redirect to Page