- Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
- t*@w***.de
<?php
$email = "testa@weste.de";
$pattern = "/^\w\K[^\s@]+@(\w)[^\s.@]+/";
$replacement = "*@$1***";
echo preg_replace($pattern, $replacement, $email);