backslash the .s in the regexes because it's more accurate, and it's

faster.

Note the necessary doubling of the backslashes... that's because of the
change to substring_conf...


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80529 13f79535-47bb-0310-9956-ffa450edef68