Rails 3: Validate IP String

Question

In Rails 3, is there a built in method for seeing if a string is a valid IP address?

If not, what is the easiest way to validate?

Answer 1

You can also just call standard's library IPAddr.new that will parse subnets, IPV6 and other cool things: (IPAddr) and return nil if the format was wrong.

Just do:

valid = !(IPAddr.new('192.168.2.0/24') rescue nil).nil?  
#=> true

valid = !(IPAddr.new('192.168.2.256') rescue nil).nil?  
#=> false