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<?php print_r(preg_split("/[^\x30-\x39\x45-\x5A\x61-\x7A_]+/u", "histórica"));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => hist [1] => rica )