正则表达式

string test = "abc (不固定的字符） c";            Regex reg = new Regex(@"(?<=[(（])[^（）()]*(?=[)）])");            MatchCollection mc = reg.Matches(test);            foreach (Match m in mc)            {                richTextBox2.Text += m.Value + "\n";            }string type = "aaa(string)";string patting = Regex.Replace(type, @"\([^\(]*\)", "");