3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bad = ['fook', 'shoot']; $pattern = '/(?:\b(?=(?:' . implode('|', $bad) . ')\b)\w\K|\G(?!^))\w/i'; echo preg_replace($pattern, '*', 'Holy fook n shoot, Batman; The Joker\'s shooting The Riddler!');

preferences:
39.12 ms | 402 KiB | 5 Q