This post originated from an RSS feed registered with Ruby Buzz by Ryan Davis. Original Post: I doubt I'll have another release of ZenHacks, so.... STIW4 Feed Title: Polishing Ruby Feed URL: http://blog.zenspider.com/index.rdf Feed Description: Musings on Ruby and the Ruby Community... Latest Ruby Buzz Posts Latest Ruby Buzz Posts by Ryan Davis Latest Posts From Polishing Ruby

for apeiros:

class Numeric
  def commify(dec='.', sep=',')
    num = to_s.sub(/\./, dec)
    dec = Regexp.escape
    num.reverse.gsub(/(\d\d\d)(?=\d)(?!\d*#{dec})/, "\\1#{sep}").reverse
  end
end