Ok, I suck at this regex stuff. Can't wrap my head around how to do what I want based upon the resources I've found.
Goal: input field with text in the format nnnn-nnnn-nnnn
So 3 sets of 4 numeric digits, separated by 2 hyphens.
Something like: ~[0-9]{4}-[0-9]{4}-[0-9]{4}~
Is that right?
Looks right to me.