3v4l.org

run code in 300+ PHP versions simultaneously
<?php $line = "string string 4-string string string 12345 string 678249 string "; if (preg_match('/\b\d{4,}\b/', $line, $matches)) { var_dump($matches); }
Output for 7.1.25 - 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]=> string(5) "12345" }
preferences:
101.89 ms | 1476 KiB | 4 Q