正则表达式过滤字符串，在特定规则的字符串中获取字符

         
          string teststring = "fdsfdsfds[T:dd]fdfd[T:011edfdf0T]fdfdf";

            Regex r = new Regex(@"\[T:([a-zA-Z_0-9]{1,})+\]");
           
            MatchCollection ms = r.Matches(teststring);

            foreach (Match m in ms)
            {
                string dd;
                dd = m.Result("$1").ToString();
                Response.Write(dd+"<br>");
           
            }