In my table I have a field called Serial Number. How do I limit the users from putting in certain characters like a hyphen. I Just want them to be able to put in any combination of numbers and letters without other characters so there is a standard. In validation rule I can only input strings but not characters. Is this possible and how can i do it. Example: Serial Number 123-456-343 should only be typed as 123456343 and if they try to put a hyphen in it will give them an error
Thank you
Thank you