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@ 2018-06-06T19:08:11Z

<?php

$host = "https://chat.stackoverflow.com/rooms/11/php/";

$currentDomain = preg_replace('(^.+\.(?=[^.]+\.[^.]+$))', '', $host);

echo $currentDomain;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

57.49 ms | 1406 KiB | 5 Q