3v4l.org

run code in 500+ PHP versions simultaneously
<?php $str = <<<EOF aaaBbb = CccBbb aaaDddd = CccDddd aaaEeee = CccFfff EOF; preg_match_all('/^ +\w+([A-Z][a-z]+) += +(?!\w+\1).*$/m', $str, $matches, PREG_SET_ORDER, 0); var_dump($matches);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(1) { [0]=> array(2) { [0]=> string(21) " aaaEeee = CccFfff" [1]=> string(4) "Eeee" } }
preferences:
109.27 ms | 1963 KiB | 4 Q