缅甸语正则表达不起作用。 显示垃圾字符串

// $result= ဖန္တ

 $result=preg_replace(
            "/([\p{L}\p{N}A-Za-z0-9@#\".]{1,}[\p{L}\p{N}A-Za-z0-9\.\_-]{0,})/u",
            "foo[('$0')]bar",
            $result);

print_r($result);

//RESULT: foo[('ဖန')]bar္foo[('တ')]bar 

If You see here bar္foo in between there is some junk character coming don't know why? how to removed it? But if I use hello world its show expected result foo[('hello')]bar foo[('world')]bar