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string pattern = @"(?i)[x00-xff]{4,10}|[^x00-xff]{2,5}";
//获取字符串实际长度
function getLength(str) {
var realLength = 0, len = str.length, charCode = -1;
for (var i = 0; i < len; i++) {
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128)
realLength += 1;
else
realLength += 2;
}
return realLength;
}