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ruby-on-railsregexvalidationip-address
Dex
Dex

Reputation: 12749

Rails 3: Validate IP String

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?

Upvotes: 38

Views: 13461

Answers (7)

Jack
Jack

Reputation: 1451

Just wanted to add that instead of writing your own pattern you can use the build in one Resolv::AddressRegex

require 'resolv'

validates :gateway, :presence => true, :uniqueness => true,
  :format => { :with => Resolv::AddressRegex }

Resolv::AddressRegex matches both IPv4 and IPv6 addresses. If you need only one version you can use Resolv::IPv4::Regex or Resolv::IPv6::Regex.

Upvotes: 72

Dex
Dex

Reputation: 12749

The Rails way to validate with ActiveRecord in Rails 3 is:

@ip_regex = /^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/

validates :gateway, 
          :presence => true, 
          :uniqueness => true,
          :format => { :with => @ip_regex }

Good resource here: Wayback Archive - Email validation in Ruby On Rails 3 or Active model without regexp

Upvotes: 17

yuku-t
yuku-t

Reputation: 29

You can use Resolv::IPv4::Regex as Jack mentioned below if you don't need to accept subnets.

If you need to accept it, activemodel-ipaddr_validator gem may help you. (disclaimer: I'm the author of the gem)

validates :your_attr, ipaddr: true

Upvotes: 2

Francois
Francois

Reputation: 1510

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

Upvotes: 4

pragma
pragma

Reputation: 1400

You can also use Regexy::Web::IPv4 which can match ip addresses with port numbers too.

Upvotes: 0

Pedro
Pedro

Reputation: 11864

You should use a Regular Expression

Here is one that does what you want:

/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.
([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/.match("#{@systemIP}")

Upvotes: 0

Jsinh
Jsinh

Reputation: 2579

i dont know about RoR a lot, but if you dont find any built in method for validation of IP Address.

Try on this regular expression : 

"^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$"

to validate the IP Address.

I recently used it in one module so had it on desktop.

Upvotes: 0

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