static void Main(string[] args)
{
string email = "123@abc.com";
//string判断验证
if (email.Contains("@") && email.Contains(".") && (email.IndexOf("@") < email.IndexOf(".")))
Console.WriteLine("正确的邮箱格式");
else
Console.WriteLine("不正确的邮箱格式");
//正则验证
Regex regex = new Regex("^[a-z0-9]+([._\\-]*[a-z0-9])*@([a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$");
if(regex.Match(email).Success)
Console.WriteLine("正确的邮箱格式");
else
Console.WriteLine("不正确的邮箱格式");
//日期转换
DateTime datetime = DateTime.Now;
string formatedDatetime = datetime.ToString("MMMM dd,yyyy", DateTimeFormatInfo.InvariantInfo);
Console.WriteLine(formatedDatetime);
Console.ReadLine();
}