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<?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!');
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Holy f*** n s****, Batman; The Joker's shooting The Riddler!

preferences:
29.03 ms | 1152 KiB | 7 Q