How to match Chinese with regex

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<?php
$str= "中文";

$par = "\x80-\xff";
$par2= chr(0xa1).'-'.chr(0xff);
/*
*The both of $par and $par2 regx can works well. 
*/
if(preg_match("/^[$par2]*$/",$str)){
 echo "\$str is Chinese！";
}else{
 echo "\$str is not Chinese！";
}
?>