From: Carlos <angus@...>
Date: 2004-12-28T05:33:32+09:00
Subject: Re: split on '' (and another for split -1)

["trans.  (T. Onoma)" <transami@runbox.com>, 2004-12-27 20.31 CET]
> Here's a generic routine I'm working on:
> 
>   class String
>     def last=(str, separator=$/)
>       separator = '' unless separator
>       raise "separator must be a String" unless String === separator
>       s = self.split(separator, -1)
>       s[-1] = str
>       self.replace(s.join(separator))
>     end
>   end
> 
>   $/ = "\n"
>   s = "ab\nc"
>   s.last = "123"
>   p s
>   # => "ab\n123"
> 
> Now try:
> 
>   $/ = ""
>   s = "abc"
>   s.last = "123"
>   p s
> 
> Unfortunately this does not give a congruent result. 

$/="" means paragraph mode, and it is acknowledged(?) by IO#gets,
#readlines, String#each, #to_a, etc. Maybe you should do the same?

And that solves your problems with split('') ;)))).