3v4l.org

run code in 300+ PHP versions simultaneously
<?php preg_match('/(\d+)/sU', 'Осталось всего 2', $roomsLeftMatches); $left = isset($roomsLeftMatches[1]) ? $roomsLeftMatches[1] : null; var_dump($left);

preferences:
35.9 ms | 402 KiB | 5 Q