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From: Rusi <rustompmody@gmail.com>
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Subject: Re: How to grok a complicated regex?
Date: Sat, 14 Mar 2015 21:31:16 -0700 (PDT)
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On Saturday, March 14, 2015 at 6:48:41 PM UTC+5:30, Stefan Monnier wrote:
> > Here's another project (for your students): adding lookaround to Emacs
> > regexp /and/ have it merged.  It would be *insanely(!)* at times.
> 
> A better project: replace the regexp engine with one that does not
> backtrack all the time.
> 
> 
>         Stefan

http://www.colm.net/open-source/ragel/
already exists

It would be neat if it were part of emacs' core