c#正则提取和替换

/// <summary>
/// 正则表达式提取和替换内容
/// </summary>
public static string Contentextract()
{
    string result = "";
    string str = "大家好! <User EntryTime='2010-10-7' Email='zhangsan@163.com'>张三</User> 自我介绍。";
    Regex regex = new Regex(@"<Users*EntryTime='(?<time>[sS]*?)'s+Email='(?<email>[sS]*?)'>(?<userName>[sS]*?)</User>", RegexOptions.IgnoreCase);
    Match match = regex.Match(str);
    if(match.Success)
    {
        string userName = match.Groups["userName"].Value;   //获取用户名
        string time = match.Groups["time"].Value;           //获取入职时间
        string email = match.Groups["email"].Value;         //获取邮箱地址
        string strFormat = String.Format("我是：{0}，入职时间：{1}，邮箱：{2}", userName, time, email);
        result = regex.Replace(str, strFormat);    //替换内容
        Console.WriteLine(result);
    }
    return result;   //结果：大家好！我是张三，入职时间：2010-10-7，邮箱：zhangsan@163.com 自我介绍。
}