Checking if ip is correct

Question

I have a script that requires the IP to be written correctly.

Examples:

192.168.0.1 -> echo ok
1.2.3.4 -> echo ok
4.3.a.3 -> echo Not ok
300.52.256.1 -> not ok
1.2.3.4.5 -> not ok

I've tried this:

 if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]
               then
                            echo SUCCES!

But this is not good enough since 300.2.3.4 is a good IP for this expression.

The only accepted IPs should be something like (0-255).(0-255).(0-255).0-255)

https://stackoverflow.com/a/25969006/2072269 – muru Jul 29 '19 at 11:06 — muru, Jul 29 '19 at 11:06
Thank you,i found what I was looking for – Robert Dumbrava Jul 29 '19 at 12:54 — Robert Dumbrava, Jul 29 '19 at 12:54

score 1 · Answer 1 · answered Jul 29 '19 at 13:02

1

OK,I found out the answer:

if [[ "$ip" =~ ^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ ]];
           then
                                echo SUCCES!

Thanks to @muru for helping!

answered Jul 29 '19 at 13:02

Robert Dumbrava

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Checking if ip is correct

1 Answers1