PHP PHP（RegEx）IP地址验证

Posted 2021-05-15

$string = "255.255.255.255";
if (preg_match(
'/^(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:[.](?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}$/',
$string)) { 
echo "IP address is good.";
}