How to make an regularexpression ..

[Anon]

I would like to make an regular expression that check if a string i as legal ip-adress.

How do i do that?

[[deleted]]

Search the forum, this has been asked and answered 🙂

[Anon]

I have searched for "IP", but that give me no results...

[[deleted]]

Well you may want to search for a bit more than just "IP"...

anyway, here's the link
http://www.phpbuilder.com/forum/archives/1/2001/1/3/109167

and this is the expression

(this is all one line)
preg_match('/^{(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9]).(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])$/',$ip_string)}