Thanks for the tips. I'd definitely like to test on a more accurate basis, but the problem was specific enough for this to work. At least, it has worked so far. :)

A good idea might be to anchor the regex to match at the beginning and end of the line, this would lessen the non-specific matching problem that you mention.

I was actually thinking of writing Nagios plugins to test all of these services, but that's a task for another day, while this was simply a half hour of scripting.