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<?php preg_match_all('/[\p{L}]/', 'test åäö', $matches); var_dump($matches);
Output for 5.2.10 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { [0]=> array(7) { [0]=> string(1) "t" [1]=> string(1) "e" [2]=> string(1) "s" [3]=> string(1) "t" [4]=> string(1) "�" [5]=> string(1) "�" [6]=> string(1) "�" } }
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.9
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" } }
Output for 4.3.11, 5.0.0 - 5.0.4
Warning: preg_match_all(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 2 in /in/RkR2B on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 2 in /in/RkR2B on line 3 array(0) { }

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