CODEWITHSUNDEEP
javaregex
Subodh Joshi
Subodh Joshi

Reputation: 13492

regular expression pattern to accept one or multiple ip addresses?

I am using below regular expression pattern 

pattern="^(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))\.(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))$|\s*

It will accept any one of the below ip address

1.1.2.3 or 192.122.134.1 or 198.23.45.56

But i want it should accept single as well as ip addresses with comma separated as well like below

1.1.2.3,192.122.134.1,198.23.45.56

What changes i have to do in my regular expression?

Upvotes: 0

Views: 6129

Answers (5)

Sujiraj R
Sujiraj R

Reputation: 1642

<input type="text" name="country_code" pattern="^(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))(,(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])))*$">

Use this input field in your HTML file

Upvotes: 0

achabahe
achabahe

Reputation: 2565

this should work

^((2([0-4]\d|5[0-5])|1\d\d|[0]?[1-9]\d|[0]?[0]?\d)(\.(2([0-4]\d|5[0-5])|1\d\d|
[0]?[1-9]\d|[0]?[0]?\d)){3}([\s,](?!$)|$))*$

it will accept comma separated and space separated ips

Upvotes: 0

Minothor
Minothor

Reputation: 326

([1-9]\d?\d?(\.\d{1,3}){2}\.\d{1,3},?)+

A little over Reductionist perhaps, but that should handle it. (you will need to trim out the commas from the matches though) Edited to restrict matches to the range of 1...* -> 999...*

Upvotes: 1

Maciej Dobrowolski
Maciej Dobrowolski

Reputation: 12122

It slowly becomes incomprehensible, but here you are:

^(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5]))(,(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])))*$

What happens here is:

let's call your IP regexp IP:

IP = ((\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])).(\d|[1-9]\d|1\d\d|2([0-4]\d|5[0-5])))

so we just have to repeat it with comma:

^IP(,IP)*$

Upvotes: 5

SomeJavaGuy
SomeJavaGuy

Reputation: 7347

I´d rather not use regex as @biziclop did say.

You could just split the whole String and pass the ip adress to the InetAddress.html#getByName method. from the documentation of the method:

If a literal IP address is supplied, only the validity of the address format is checked

Basicly you could just pass the adress to this method, and the class itself would supply a validation of the adress. If the addres would be invalid you would run into a java.net.UnknownHostException which you would just have to catch. This way you would just have to create a regex that will successfully split all the ip-adresses

public static void main(String[] args) throws UnknownHostException {
    String adresses = "1.1.2.3.15,192.122.134.1,198.23.45.56";
    for(String s : adresses.split(",|\\sor\\s")) {
        try {
            InetAddress adress = Inet4Address.getByName(s);
        } catch (UnknownHostException e) {
            System.out.println("Invalid format for ip adress " + s);
        }
    }
    adresses = "1.1.2.3 or 192.122.134.1 or 198.23.45.56 ";
    for(String s : adresses.split(",|\\sor\\s")) {
        try {
            InetAddress adress = Inet4Address.getByName(s);
        } catch (UnknownHostException e) {
            System.out.println("Invalid format for ip adress " + s);
        }
    }
}

output: 

Invalid format for ip adress 1.1.2.3.15

Upvotes: 0

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