3v4l.org

run code in 500+ PHP versions simultaneously
<?php $text = "This is a text with some@email.com an e-mail address in it"; echo preg_replace_callback( '~[\w.-]+@(?:[\w-]+\.)+\w+~', function($m) { return "**{$m[0]}**"; }, $text );

preferences:
55.55 ms | 1374 KiB | 5 Q