3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'AB?????DE'; if (preg_match('/(.)\\1{3}/', $str, $matches)) print_r($matches);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Array ( [0] => ???? [1] => ? )
preferences:
138.25 ms | 407 KiB | 5 Q