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<?php $str = "51-200 employees"; preg_match_all("/\d+/", $str, $matches); var_dump($matches[0]);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.3.7
array(2) { [0]=> string(2) "51" [1]=> string(3) "200" }

preferences:
197.68 ms | 403 KiB | 301 Q