php - regex hostname extraction

Question

I have been looking around for a regex expression that will spit out just the 'stackoverflow' part and no www. or .com etc. All I could find was to check if the url's were valid... I have used php's url filter to determine that much I now am looking to determine which site it is.

I have never written an expression before so I am hoping someone can check it/recommend a better solution.

preg_match('@^(?:http://)(?:www.)?([^.]+)@i', $url, $matches)

edit: All the url's I am dealing with are .com if that helps

Waleed Amjad · Accepted Answer · 2009-11-28 20:14:59Z

5

Have you considered PHP's parse_url() function?

answered Nov 28, 2009 at 20:14

Waleed Amjad

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Mark Over a year ago

the function is really great.... except it still leaves me with sometimes being 'www.' and sometimes no 'www.' so I will still have to preg_replace the www.

Galen · Accepted Answer · 2009-11-28 20:24:46Z

2

one-liner without using regular expressions!!!

$url = 'http://stackoverflow.com';
$d = array_shift( explode( '.', str_replace('www.', '', parse_url( $url, PHP_URL_HOST )) ) );
echo $d;

answered Nov 28, 2009 at 20:24

Galen

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2 Comments

Mark Over a year ago

haha... its only a one liner because you stuck it all in one line :) Regardless it works well. Its the best so far.

Kumar Over a year ago

This fails. Use this string www.myusualhost-test.co.in.php53-1.dfw1-2.websitetestlink.com and it gives me myusualhost-test whereas I just want myusualhost-test.co.in.php53-1.dfw1-2.websitetestlink.

johannes · Accepted Answer · 2009-11-28 20:02:28Z

0

If you know that the thing you're having is a URL and the domain end in .com a simple thing like

preg_match('#([^\.]*)\.com#', $url, $matches);

should do the trick.

While this will fail on a domain like www.com.foo.com but might be enough, depending on your situation.

answered Nov 28, 2009 at 20:02

johannes

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Comments

Matteo Riva · Accepted Answer · 2009-11-28 20:03:09Z

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preg_match('#https?://(?:www.)?(.*?)\.com#i', $str, $match);

answered Nov 28, 2009 at 20:03

Matteo Riva

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