create

# File lib/resolv.rb, line 2321
    def self.create(arg)
      case arg
      when IPv4
        return arg
      when Regex
        if (0..255) === (a = $1.to_i) &&
           (0..255) === (b = $2.to_i) &&
           (0..255) === (c = $3.to_i) &&
           (0..255) === (d = $4.to_i)
          return self.new([a, b, c, d].pack("CCCC"))
        else
          raise ArgumentError.new("IPv4 address with invalid value: " + arg)
        end
      else
        raise ArgumentError.new("cannot interpret as IPv4 address: #{arg.inspect}")
      end
    end