From: James Edward Gray II <james@...>
Date: 2006-12-06T04:05:28+09:00
Subject: Re: doubt with positive lookaround

On Dec 5, 2006, at 12:58 PM, danfinnie@optonline.net wrote:

> There are a few types of "lookarounds": positive lookahead,  
> negative lookahead, positve lookbehind, negative look behind.
>
> To use positive lookbehind, you would use (?<=...).  Ruby might be  
> interpreting ?=< as ?<=.  Try escaping the < by adding a \ before it.

The regex engine in Ruby 1.8 does not support look-behind  
assertions.  The regex engine in 1.9, Oniguruma, does.

James Edward Gray II