For now we default to REG_EXTENDED, but it might make sense
to let the user control this flag and the case sensitivity.

Another concern is the stringification of regexps, it may lead
to backslash madness.  Maybe we should define '...' string types
also and do no backslash substitution in those at all.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@559 d4fa192b-c00b-0410-8231-f00ffab90ce4