grep external file in condition line?

I need to make a recipe as follows:

:0:
* ^From.*(addy1|addy2|...|addyn)
somefolder

But I would really like to avoid overloading the condition line with a
huge amount '|'-separated addresses.

I was wondering if I could put the addresses (currently about 30) in
an external file and have the condition line grep the external file of
addresses for a match.

If that isn't possible, are there any non-brute-force suggestions that
anyone could offer?