regex validation for IP address

[bbaassiri]

I have the following function

function IsValidIpAddress( $IP )
{
	$result = preg_match("/^([1-9]|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-4])$/",$IP,$matches);
	return $result;
}

it matches address well but also matches address like

192.009.012.254

Any ideas on how i can fix this regex

[Jayson]

There shouldn't be anything invalid about that address should there? Yeah it can be shortened to 192.9.12.254, but 192.009.012.254 should still be a valid address.

[Weedpacket]

function validate_ip($ip)
{
$result=preg_match('/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/',$ip,$quads);
return ($quads[1]<=255 && $quads[2]<=255 && $quads[3]<=255 && $quads[4]<=255);
}

Of course a one-liner would be

function validate_ip($ip)
{ return long2ip(ip2long($ip))==$ip;
}

[Jayson]

Originally posted by Weedpacket
Of course a one-liner would be

function validate_ip($ip)
{ return long2ip(ip2long($ip))==$ip;
}

[/B]

Wow, how did you ever think of something as clean and efficient as that. Amazing! 😃