Converting camel case to underscore case in ruby

by

Rails’ ActiveSupport
adds underscore to the String using the following: 

class String
  def underscore
    self.gsub(/::/, "https://stackoverflow.com/").
    gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
    gsub(/([a-z\d])([A-Z])/,'\1_\2').
    tr("-", "_").
    downcase
  end
end

Then you can do fun stuff: 

"CamelCase".underscore
=> "camel_case"

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