IP Address Regular Expression

[thomasschmidt93]

Hello community,

 

I have failed to create a regular expression that checks a custom field for a valid IP address. I have looked up multiple expressions on the internet, but it always return non-valid.

 

Does anyone of you have an expression that I can copy paste in to my custom field validation?

 

Respectfully,

Thomas Schmidt

[brian!]

try this...

 

/^((25[0-5]|2[0-4][0-9]|[01]?[1-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[1-9][0-9]?)$/

[thomasschmidt93]

Hello, I'm so sorry for the late response!

 

That is working beautifully, but it also blocks if nothing i typed in the field, and this field is not required, but if a client specifies something in there, it needs to check it. How can I change, so it also allows nothing?

[brian!]

Hi Thomas,

 

try the following - it should check for the field being empty and allow it - though if something is entered, it will still check that it's a valid IP address.

 

/^(?((25[0-5]|2[0-4][0-9]|[01]?[1-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[1-9][0-9]?))$/

[thomasschmidt93]

Hi Thomas,

 

try the following - it should check for the field being empty and allow it - though if something is entered, it will still check that it's a valid IP address.

 

It works!

 

Thank you very much!