Solve the problem of Chinese php regular expression verification

$str = 'People's Republic of China 123456789abcdefg';
echo preg_match("/^[u4e00-u9fa5_a-zA-Z0-9]{3,15}$",$strName);
?>

Run the above code, you will be prompted: Warning: preg_match(): Compilation failed: PCRE does not support L, l, N, P, p, U, u, or X at offset 3 in F:wwwrootphptest.php on line 2

The reason is because: PHP regular expressions do not support the following Perl escape sequences: L, l, N, P, p, U, u, or X

In UTF-8 mode, "x{...}" is allowed, and the content in the curly brackets is a string representing a hexadecimal number. The original hexadecimal escape sequence xhh matches a double-byte UTF-8 character if its value is greater than 127.

Solution: preg_match("/^[x80-xff_a-zA-Z0-9]{3,15}$",$strName);

For example, the following example:

/**
 * php regular expression verification Chinese
 * edit bbs.it-home.org
*/
$shouji = "Hahahaha";
if (!preg_match("/^[x80-xff]{6,30}$/" ,$shouji)){
echo "nonono";
}
else {
echo "yesyesyes";
}
?>