正则表达式之提取中文

static void Main(string[] args)
{
string str = "asd=-.我是中文{asdasd";
Console.WriteLine(GetChineseWord(str));
Console.ReadKey();
}
public static string GetChineseWord(string oriText)
{
string x = @"[u4E00-u9FFF]+";
MatchCollection Matches = Regex.Matches
(oriText, x, RegexOptions.IgnoreCase);
StringBuilder sb = new StringBuilder();
foreach (Match NextMatch in Matches)
{
sb.Append(NextMatch.Value);
}
return sb.ToString();
}

很简单，不想废话，最终控制台输出的就是“我是中文”这几个字