# File lib/more/facets/random.rb, line 354
      def random(max_length = 8, char_re = /[\w\d]/)
        # gmosx: this is a nice example of input parameter checking.
        # this is NOT a real time called method so we can add this
        # check. Congrats to the author.
        raise ArgumentError.new('char_re 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