Regular expression for asp:RegularExpressionValidator with format MMddyy (leap year issue)

Question

We need help for regular expression that work with asp.net asp:RegularExpressionValidator to validate date in MMddyy format. Problem we are facing is leap year. Issue is tha

Answer 1

Since you need logic to validate leap years, consider using a CustomValidator. I put this together relatively quickly, but hopefully you'll get the idea.

protected void dateFormatValidator_ServerValidate(object source, ServerValidateEventArgs args)
{
    if (args.Value.Length == 6)
    {
        var month = args.Value.Substring(0, 2);
        var day = args.Value.Substring(2, 2);
        var year = args.Value.Substring(4, 2);

        DateTime dummyValue;
        args.IsValid = DateTime.TryParse(month + "/" + day + "/" + year, out dummyValue);
    }
    else
    {
        args.IsValid = false;
    }
}