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<?php $variable = "abcxyz ABCXYZÅåÄäÖö\t\r\n*0123456789"; var_dump(preg_match('/^[a-z A-Z\Å\å\Ä\ä\Ö\ö\s*\d]+$/u', $variable));
preferences:
24.47 ms | 402 KiB | 5 Q