class IP
    # Class method containsIP first checks for a valid IP address in the string
    # and then creates an instance of IP
    def self.containsIP?(ipaddress)
        if (ipaddress.is_a?(String))
            # Search the string for regular IP address pattern and convert result into
            # an array
            m = ipaddress.match(/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/).to_a

            # Delete the ipaddress from the resulting array
            m.delete(ipaddress)

            # Convert the string literals into integers
            i = Array.new
            m.each { |s| i << s.to_i }
            if (i.size == 4)
                # a, b, d and d all in valid range?
                if (i - (0..255).to_a).empty?
                    new(i[0], i[1], i[2], i[3])
                else
                    puts "IP is not in valid range."
                end
            else
                puts "Did not find a valid IP address in #{ipaddress}"
            end
        else
            puts "Error: I expected a string containing an IP address."
        end
    end

    def initialize(a, b, c, d)
        @a = a
        @b = b
        @c = c
        @d = d
    end

    def to_s
        "#{@a}.#{@b}.#{@c}.#{@d}"
    end
end