Merge r1641384 from trunk:

the next sentence says:

The URL argument must be parsable as a URL before regexp substitutions (as well as after). This limits the matches you can use. For instance, if we had used





git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1641386 13f79535-47bb-0310-9956-ffa450edef68