$re = '/^((0[1-9]|[12]\d|3[01])-(0[1-9]|1[0-2])-[12]\d{3} (0[0-9]|1[0-9]|2[1-4]):(0[0-9]|[1-5][0-9]):(0[0-9]|[1-5][0-9]))$/m';
$str = '10-12-2022 23:59:59
10-22-2022 2:59:59
10-12-2022 02:59:99
10-12-2022 02:59:59
00-12-2022 02:59:59
10-22-2022 02:59:59
10-12-2022 025959
// You can show origina post on albertcolom.com/blog';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php