Is it impractical, though? It's already been written, and I've not seen any suggestion that it's not correct (other than the problem with comments, but that's

Is it impractical, though? It's already been written, and I've not seen any suggestion that it's not correct (other than the problem with comments, but that's intrinsic to regexes in general). As long as you're going to follow up by actually sending an email, I don't see a problem with this as a first-pass filter.