IP address format check

Question

I am developing a Ruby on Rails application by using Ruby v1.8.7 . My question is more about Ruby language.

I know there is a build-in Ruby library named IPAddr in Ruby v1.8.7 . It handles IP address related issues well. But, seems it does not provide any method to check IP address format.

Could someone provide me a good way to check IP address format(IPv4 and IPv6 addresses) in Ruby? Thank you.

P.S.

I tried a regular expression way:

ip_regex = ^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.
([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.([01]?\\d\\d?|2[0-4]\\d|25[0-5])$

ip_addr='127.0.0.3'
ip_addr =~ ip_regex

But it does not work...

You need to fix your regular expression `ip_regex = /^([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])$/` — taro, Dec 16 '11 at 10:34
@taro, can you answer the question instead of comment, so that I can accept your answer — Mellon, Dec 16 '11 at 11:26

score 6 · Answer 1 · edited Oct 04 '14 at 02:03

6

http://www.ruby-doc.org/stdlib-1.8.7/libdoc/ipaddr/rdoc/IPAddr.html

The IPAddr class already provides methods to check whether they're IPV4 or IPV6 formats:

#ipv4?
#ipv6?

edited Oct 04 '14 at 02:03

slm

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answered Oct 25 '12 at 22:02

Bryan

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I'd recommend this method, it supports both IP4 and IP6 type addresses, and won't break on you in the future. – Peter Nov 16 '12 at 01:04
ActiveValidators, as mentioned by Damien, relies on IPAddr, so it's really up to whether or not you want to use a gem for that (which does plenty of other validations). – Franck Verrot Dec 02 '12 at 13:47
Something to keep in mind here is that those methods only work on an instance of the IPAddr class. So, if a non-IP value was suppplied like "300.300.300.300", you'd end up with an Argument error before you could use those methods. – claudijd Oct 30 '13 at 13:50

Damien MATHIEU · Answer 2 · 2011-12-16T10:32:15.853

3

ActiveValidators has an IP validator.
It uses a regex for any ipv4, and Resolv::IPv6::Regex for any ipv6 address.

To use it, it's very simple.
Add activevalidators to your Gemfile.

gem 'activevalidators'

Then, in your Computer class :

class Computer << ActiveRecord::Base
  validates :remote_address,
    :ip => { :format => :v4 }
end

edited Dec 16 '11 at 10:32

answered Dec 16 '11 at 09:47

Damien MATHIEU

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If I have a model class computer << ActiveRecord, how to use this validtor? – Mellon Dec 16 '11 at 10:25
Hi, I am developing a Rails v2.3.2 app. Seems the activevalidators only support Rails v3 ... Because I add the gem and run bundle install, it complains about my activerecord version – Mellon Dec 16 '11 at 11:09
Well, yeah, it is only rails3. You can still get the regex and use it in your rails2 app. Or (even better), upgrade ! – Damien MATHIEU Dec 17 '11 at 15:37

score 1 · Accepted Answer · answered Dec 16 '11 at 11:51

1

Looks like your regular expression is wrong. It should be:

/^([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])$/

answered Dec 16 '11 at 11:51

taro

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score 0 · Answer 4 · answered Feb 04 '20 at 18:38

0

validates :ip,
      :format => {
        :with => Regexp.union(Resolv::IPv4::Regex, Resolv::IPv6::Regex)
      }

From https://stackoverflow.com/a/15157862/378006

answered Feb 04 '20 at 18:38

wingfire

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IP address format check

4 Answers4