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<?php $tests = ['t1', 't23', 't0', 'tt', 't2232', 't333', 't992t']; $result = []; foreach($tests as $test) { $number = preg_replace("/^t(\d+)$/", "$1", $test); if (is_numeric($number)) { $result[] = $number; } } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1 [1] => 23 [2] => 0 [3] => 2232 [4] => 333 )

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