正则表达式过滤如'xF0x9Fx98'16进制字符

JS实现：

var str = "ss123ssxF0x9Fx98x82xF0x9F";
str = str.replace(/[^\x00-xFF]/g,"");
console.log(str);//ss123ss

PHP实现：

$str = "ss123ssxF0x9Fx98x82xF0x9F";

$str = preg_replace("/[^\x00-xFF]/m", "", $str);

echo $str."<br />";//ss123ss

if(!preg_match_all("/^[x{4e00}-x{9fa5}A-Za-z0-9_]+$/mu",$str,$matches)){ //UTF-8汉字字母数字下划线正则表达式,如果不匹配,证明字符串非全中文和字母，可能含有标点符号或者表情符号
    $str = preg_replace("/[^\x00-xFF]/m", "", $str);//执行过滤
}