Decorator that kind of implements Null Object pattern

null_object_decor

module Utils
  class StringDecorator

    def initialize(string)
      @string = string
    end

    def =~(regex)
      self.to_s =~ regex
    end
    
    def nil?
      @string.nil?
    end
    
    def to_s
      @string
    end
    
    def string
      @string
    end
    
    def method_missing(name,*args,&block)
      if self.nil?
        self
      elsif self.string.respond_to? name
        @string = @string.send(name,*args)
        self
      else
        super
      end
    end
  end
end