C# 正则表达式有关问题,如果输出替换的内容

C# 正则表达式问题,如果输出替换的内容

C# code

protected void Page_Load(object sender, EventArgs e)    {        string aa = "a12,13b";        Regex re = new Regex(@"/[^\d]+/g");        Match m = re.Match(aa);        Console.WriteLine(m.Groups[1].Value);    }

C# code

protected void Page_Load(object sender, EventArgs e){    string aa = "a12,13b";    Regex re = new Regex(@"\D+");    string result = re.Replace(aa, "");    Response.Write(result);}