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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);
}
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);
}