From: Martin DeMello <martindemello@...>
Date: 2002-12-08T01:55:39+09:00
Subject: Re: regexp: zero-width match for PRECEDING atom

nobu.nokada@softhome.net wrote:
> Hi,
> 
> At Sun, 8 Dec 2002 00:43:06 +0900,
> Emmanuel Touzery wrote:
>>       I'm looking for the pattern which is (?<!pattern) in perl and \@<! in vim  
>> for ruby, but it seems not to exist (while some other (?:), (?=) (?!) 
>> sequences do exist).
> 
> Currently, lookbehind is not implemented.  Oniguruma RE engine
> has it and will be used in future.

Meanwhile, http://japhy.perlmonk.org/sexeger/sexeger.html#3.1 might
help.

martin