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<?php echo preg_match('/^([\d]+\.[\d]+\.[\d]+)/', '5.5.5-pl-udmedia', $array); var_dump($array);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1array(2) { [0]=> string(5) "5.5.5" [1]=> string(5) "5.5.5" }