I think I'll add a const "." function to test for each entry
only having one period.

I'm not sure what you are saying here. I will say that the Like operator is
like a (very, very) miniature Regular Expression parser and, as such, it can
be tricky to get the exact match patterns that you need. You have to test
any pattern you develop against the extreme possible entries to make sure
you have a bullet-proof system.

Rick