<?php function clean($str){ $re = "/([0-9a-zA-Z]|\x{500}-\x{6FF}]{0,})/u"; preg_match_all($re, $str, $matches); return isset($matches[0]) ? implode($matches[0]) : ''; } echo clean('a|"bc!@Β£d艾β012艾e^&$ییییfg'); echo "\n"; echo "\n"; echo clean('$$$'); //echo abcd012eییییfg
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