My question what are the steps you use in the data Assist wizard to reproduce the problem.
you're example of the expression:
"\b(1[0-2]|0[1-9]):[0-5]\d\s[ap]m\b/i"
is out of context. I need to know what settings you are using to generate the page s and where you are seeing the expression in your example in order to be able to log a comprehensive bug,