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@ 2017-08-24T11:04:25Z

<?php

$email = "example.gmail.com";
$new_email  = preg_replace("/([_a-zA-Z0-9-]{2})([-a-z0-9]*)((.|@)[_a-zA-Z0-9-]+)/i", "$1****$3", $email);
echo $new_email;

Output
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

171.03 ms | 404 KiB | 5 Q