# File lib/standard/facets/random.rb, line 376
      def random(max_length = 8, char_re = /[\w\d]/)
        raise ArgumentError.new('second argument must be a regular expression') unless char_re.is_a?(Regexp)
        string = ""
        while string.length < max_length
            ch = Random.number(255).chr
            string << ch if ch =~ char_re
        end
        return string
      end