# File lib/oniguruma.rb, line 271
      def inspect
         opt_str = ""
         opt_str += "i" if (@options[:options] & OPTION_IGNORECASE) > 0
         opt_str += "m" if (@options[:options] & OPTION_MULTILINE) > 0
         opt_str += "x" if (@options[:options] & OPTION_EXTEND) > 0
         "/" + @pattern + "/" + opt_str
      end