From: Siep Korteling <s.korteling@...>
Date: 2008-01-22T07:35:15+09:00
Subject: Re: Is there an easier way to get a match before a position in a  string?

William James wrote:
...
> 
> 
> str = "\
> I don't necessarily need code examples -- but if anyone has
> ideas for a best approach to specifying a line wrap width
> (breaking between words for lines no longer than a specific
> column width) for output from a Ruby script, I'd love to
> hear about it."
> 
> X = 40
> puts str.gsub(/\n/," ").scan(/\S.{0,#{X-2}}\S(?=\s|$)|\S+/)

Kaspar Schiess wrote text-reform (gem install text-reform)

require 'text/reform'

r = Text::Reform.new
while line=gets
    puts r.format('['*40, line)
end


Here he says it does hyphenate:
http://blog.macromates.com/2006/wrapping-text-with-regular-expressions/
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