From: Matthew Moss <matthew.moss.coder@...>
Date: 2006-05-06T05:09:27+09:00
Subject: Re: Newbie question

Here's a quick attempt:

x = ["&Edit", "P&roject", "Noamp", "Vi&ew", "S&ample", "T&ree"]
y = Hash.new { |h,k| h[k] = Array.new }

x.each do |s|
   if m = /&(.)/.match(s)
      y[m[1].downcase] << s
   end
end

y.values.select { |v| v.size > 1 }.flatten


=> ["&Edit", "Vi&ew", "P&roject", "T&ree"]