Escape dots that are meant to be dots in regexes.

Various regexes were of form ".*.suffix" where the first dot means
"any character at all" and the second actually means exactly the same
so is almost superfluous (the pattern /.*./ is equivalent to /.+/),
except that it was clearly meant to mean "a dot"; to make it so,
escape it !
Merge pull request #256 from ediosyncratic/slashdot-fix

Escape dots that are meant to be dots in regexes.