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<?php preg_match_all('/[\x0080-\xffff]/u', 'test åäö', $matches); var_dump($matches);
based on luZJl
Output for 4.3.0 - 7.2.0
array(1) { [0]=> array(7) { [0]=> string(1) "t" [1]=> string(1) "e" [2]=> string(1) "s" [3]=> string(1) "t" [4]=> string(2) "å" [5]=> string(2) "ä" [6]=> string(2) "ö" } }