在PHP和Jquery中验证网址？

$url = "http://www.example.com";

if (filter_var($url, FILTER_VALIDATE_URL)) {
    echo "网址有效";
} else {
    echo "网址无效";
}

var url = "http://www.example.com";
var pattern = /^(http|https):\/\/([\w.]+\/?)\S*$/;

if (pattern.test(url)) {
    console.log("网址有效");
} else {
    console.log("网址无效");
}