class MatchData: MatchData encapsulates the result of matching a Regexp against string. It is returned by Regexp#match and String#match, and also stored in a global va| docs.ruby-lang.org
class Array: en. wikipedia.| docs.ruby-lang.org
class Regexp: en. wikipedia.| docs.ruby-lang.org
class Object: Object is the default root of all Ruby objects. Object inherits from BasicObject which allows creating alternate object hierarchies.| docs.ruby-lang.org