I am usually pretty good at regexes but this one has me stumped.
I want to basically match any line that has a period in it, but only if
that period is not part of a salutation.  Ideally I want to do this
with a single regex.

Thus:
'end of line. And we continue'    # should match
'The incredible Mrs. Robner'      # should not match
'Sammy Davis Jr. is an okay guy.' # should match, due to last .

I tried doing something logical, like:

/(?!Jr\.|Sr\.|Miss\.|Mr\.|Mrs\.)\./

but, alas, this does not work.  Any ideas?