PHP REGEX: Get domain from URL

Question

What I want

---

I want to get from a URL the domain part so from http://example.com/ -> example.com

Examples:

---

+----------------------------------------------+-----------------------+
| input                                        | output                |
+----------------------------------------------+-----------------------+
| http://www.stackoverflow.com/questions/ask   | www.stackoverflow.com |
| http://validator.w3.org/check                | validator.w3.org      |
| http://www.google.com/?q=hello               | www.google.com        |
| http://google.de/?q=hello                    | google.de             |
+----------------------------------------------+-----------------------+

I found some related questions in stackoverflow but none of them was exactly what I was looking for.

Thanks for any help!

Answer 1

Here's my quick and dirty solution.

http://([^/]+).*

I haven't tested it, but it should grab anything between the http:// and the first slash.

Answer 2

Assumes that http:// prefixes everything.

$tmp = explode("/", $url);
$domain = $tmp[2];

Answer 3

There's no need to use a regex for this. PHP has an inbuilt function to do just this. Use parse_url():

$domain = parse_url($url, PHP_URL_HOST);

Answer 4

parse_url is already a PHP function, no need to duplicate it. http://php.net/manual/en/function.parse-url.php

Answer 5

if (preg_match('/http:\/\/([^\/]+)\//i', $target_string, $matches)) {
  $domain = $matches[1];
}

Answer 6

$tmp = parse_url($url);
$url = $tmp['host']