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From: Glenn Morris <r...@gnu.org>
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Subject: Re: does emacs regular expression support (?!expression)
Date: Thu, 02 Feb 2012 17:09:43 -0500
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Tim Landscheidt wrote:

> In Perl, "(?!pattern)" is a zero-width negative look-ahead
> assertion.  Emacs does not support these AFAIK.

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=5393
(to date, not applied)

See also the linked
http://lists.gnu.org/archive/html/emacs-devel/2012-01/msg00732.html