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run code in 200+ php & hhvm versions
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<?php $url = "http://www.mysite.com/section/index.php"; preg_match('/((?:\w+\.)+\w+)/', $url, $matches); var_dump($matches);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> string(14) "www.mysite.com" [1]=> string(14) "www.mysite.com" }