I just started dabbling in writing a major mode for Emacs and found there is a great mode build in for testing Emacs regex. If you use Emacs, open a file and th

I just started dabbling in writing a major mode for Emacs and found there is a great mode build in for testing Emacs regex. If you use Emacs, open a file and then start the mode with "M-x re-builder". You can type regex in the input buffer and see it highlighting in real time. It's pretty slick.