From: ThoML <micathom@...>
Date: 2008-02-12T18:49:55+09:00
Subject: Re: Return number of matches

> string.scan(/[^\\]\$/).size

This fails on input like "$$$$", since the string will be split into "$
$", "$$". It will also not find the first $ in the string but this
could be amended by using (^|[^\\]).