Did anybody find a good solution to this annoying problem in the last 6 years since the original post?
I am very annoyed by lack of perl style regular expressions (or PCRE) in emacs and don't want to learn the limited emacs regex.
I will appreciate an answer or work around?
I found a work around. Within emacs type C-u M-| and then type your favorite typical perl command to substitute with regex. And of course, this will support perl regex