Yes, I'm still working on it. I understand that the syntax ...1234[!a-c]... is not working because it wants something that does have a fifth character (just not a, b, or c). But I am still sorting out how to properly tell it what I want. If I start with ID 1234, I want it to look for strings that contain ONLY 1234, no letters. If I start with ID 1234A, I want it to look for strings that contain ONLY 1234A. Any ideas on how to differentiate? Thanks!Originally Posted by kenhigg