Merge r1827599, r1827604 from trunk:

Placeholder for RegexDefaultOptions.

Improvement and correction welcome.

Follow up to r1827599: don't mention EXTENDED.

It does/can *not* work as expected for now.




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1828061 13f79535-47bb-0310-9956-ffa450edef68