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\U6e20\U9053\U9a8c\U8bc1\U5931\U8d25:\U6821\U9a8c\U767b\U5f55\U5931\U8d25
string test = "\u8d60\u9001\u5931\u8d25";
Regex reg = new Regex(@"(?i)(?<=\\u)[0-9a-f]{4}");
string result = reg.Replace(test, delegate(Match m) {return ((char)Convert.ToInt32(m.Value, 16)).ToString(); });
richTextBox2.Text = result;
/*------输出------
赠送失败
*/