Re: does emacs regular expression support (?!expression)

[Kevin Rodgers]

On 2/2/12 2:45 PM, Tassilo Horn wrote:
> Tim Landscheidt<tim@tim-landscheidt.de>  writes:

> > In Perl, "(?!pattern)" is a zero-width negative look-ahead
> > assertion.  Emacs does not support these AFAIK.
>
> I see.  So when you do /foo(?!bar)/ in Perl, you'd need to do
> "foo\\(?:[^b][^a][^r]\\)" in elisp.

IIUC, the Perl regex would successfully match "foo" if it were followed by
"far", but the Emacs regexp would not.

Maybe \(?:[^b][^a][^r]\) should be \(?:[^b]\|b[^a]\|ba[^r]\)

--
Kevin Rodgers
Denver, Colorado, USA