Lock down ereg's length

[Aludaan]

I am not sure if I am just missing a pattern matching character but I am trying to do a pattern match to verify IP's.

I am using the pattern:

"^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$"

This works almost perfectly. The problem is they could use 4+ numbers in the IP and it thinks it is ok. Is there a way to specifically check for at least 1 but not more then 3 instances of [0-9]?

Thanks,

Aludaan

[laserlight]

This doesnt directly answer your question (since the pattern I wrote is in PCRE), but you could take a look at another thread on IP address regex matching.

[bpat1434]

// eregi
$pattern = "^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$";
// preg
$pattern = "@[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}@";

Don't know eregi, but that pattern in preg_match would work...

EDIT
Confirmed by the users manual:
[man]eregi/man

eregi("^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$", $ip);

[laserlight]

that pattern in preg_match would work

I agree, except that it would match octets with numbers greater than 255.

[bpat1434]

Could always expand it (ugly way though) to this:

eregi("^[0-2]{1}?[0-5]{1}?[0-5]{1}?\.[0-2]{1}?[0-5]{1}?[0-5]{1}?\.[0-2]{1}?[0-5]{1}?[0-5]{1}?\.[0-2]{1}?[0-5]{1}?[0-5]{1}?$", $ip);

[Aludaan]

Yeah, I didn't see the { brackets in there. Saw just about all the other types but not those. Figures.

Thank you everyone for your help,

😃

Aludaan

[Weedpacket]

If you've wanting to match an IP address, check out [man]ip2long/man. Much simpler than faffing about with regexps.