# File lib/rspec/matchers/pretty.rb, line 54 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