3v4l.org

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<?php $value = 'mercedes-benz'; $pattern = '`&{2}|\|{2}|[-+/!(){}[\]^"~*?:\\\]\K`'; $replace = '\\\\\\'; echo preg_replace($pattern, $replace, $value);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
mercedes-\\benz

preferences:
96.73 ms | 1240 KiB | 4 Q