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@ 2017-06-01T09:47:45Z

<?php

$mail = "Test@test.com";

preg_match("/(.)(.*?)@(.*)/", $mail, $Match);

$str = $Match[1] . str_pad("", strlen($Match[2]), "*"). "@" . str_pad("", strlen($Match[3]), "*");
echo $str;

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
str_pad: documentation ( source)

preferences:dark modelive previewkey bindings

25.36 ms | 405 KiB | 5 Q