How to use regular expressions_PHP tutorial

Because Chinese ASCII codes have a certain range. So you can use the following regular expression to represent Chinese.
/^[chr(0xa1)-chr(0xff)]+$/
The following is an example of usage:
$str = "Beyond PHP";
if (preg_match("/^ [".chr(0xa1)."-".chr(0xff)."]+$/", $str)) {
     echo "This is a pure Chinese string";
} else {
echo "This is not a pure Chinese string";
}

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