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run code in 300+ PHP versions simultaneously
<?php $email = "testa@weste.de"; $pattern = "/^\w\K[^\s@]+@(\w)[^\s.@]+/"; $replacement = "*@$1***"; echo preg_replace($pattern, $replacement, $email);
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

preferences:
138.5 ms | 403 KiB | 157 Q