# File lib/rspec/matchers/pretty.rb, line 50
      def underscore(camel_cased_word)
        word = camel_cased_word.to_s.dup
        word.gsub!(/([A-Z]+)([A-Z][a-z])/,'\1_\2')
        word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
        word.tr!("-", "_")
        word.downcase!
        word
      end