class OptionParser: tutorial. rdoc].| docs.ruby-lang.org
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 Encoding: An \Encoding instance represents a character encoding usable in Ruby. It is defined as a constant under the \Encoding namespace.| docs.ruby-lang.org
literals: Literals Literals create objects you can use in your program. Backtick Literals}[#label-25x-3A+Backtick+Literals] == Boolean and Nil Literals +nil+| docs.ruby-lang.org
class String: A +String+ object has an arbitrary sequence of bytes, typically representing text or binary data. new or as literals.| docs.ruby-lang.org
class Regexp: en. wikipedia.| docs.ruby-lang.org
ractor: Ractor - Ruby's Actor-like concurrent abstraction Ractor is designed to provide a parallel execution feature of Ruby without thread-safety concerns.| docs.ruby-lang.org