3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'moooopuuuooze'; // The regex matches any character -> . in a capture group () // plus as much identical characters as possible following it -> \1+ $pattern = '/(.)\1+/'; preg_match_all($pattern, $string, $m); // sort by their length // sort by their length usort($m[0], 'length_sort'); function length_sort($a, $b) { return (strlen($a) < strlen($b)) ? 1 : -1; } echo "Longest sequence: " . $m[0][0] . "\n";
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Longest sequence: oooo
preferences:
249.4 ms | 406 KiB | 357 Q