将页面翻译成其它语言时，需要将页面上的中文字符检索出来

public string FindContents(string str)        {             string x = @"[\u4E00-\u9FFF]+";            MatchCollection Matches = Regex.Matches(str, x, RegexOptions.IgnoreCase);            StringBuilder sb = new StringBuilder();            foreach (Match NextMatch in Matches)            {                str= str.Replace(NextMatch.Value, Html.LangString( NextMatch.Value));             }             return str;        }