Merge r776325 from trunk:

Fix the error string returned by RewriteRule. RewriteRule returned "RewriteCond: bad flag delimiters" when the 3rd argument of RewriteRule was not started with "[" or not ended with "]".

PR: 45082
Submitted by: Vitaly Polonetsky <m_vitaly topixoft.com>

Submitted by: takashi
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@790878 13f79535-47bb-0310-9956-ffa450edef68