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private void button1_Click(object sender, EventArgs e)
{
string str = "AB-200701-GM-LB";
Match match = Regex.Match(str, @"(\d{6})");
if (match.Success)
{
string dateStr = match.Groups[0].Value;
DateTime dt = DateTime.ParseExact(dateStr, "yyMMdd", new CultureInfo("zh-cn"));
DateTime dt2 = DateTime.Now;
if (dt.CompareTo(dt2) <= 0)
{
MessageBox.Show("success");
}
}
}