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<?php preg_match('/value="(\d+)"/', '<input type="hidden" name="CK" value="992431121310420"/>', $match); print_r($match);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => value="992431121310420" [1] => 992431121310420 )