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@ 2014-10-22T17:09:34Z

<?php
$url = "//youtube.com";
$url = preg_replace("|([^\/]*)\/\/|i",'https://',$url);

echo $url;

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

38.22 ms | 402 KiB | 5 Q