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Turn numbers into strings with thousands' separators

Turn numbers into strings with thousands' separators (from zenspider)

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


So, you get:

   1  
   2  1233232423424.23423.commify # => "1,233,232,423,424.23"
to ruby zenspider by nicwilliams on Apr 12, 2007
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