Question

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Create a C# program that accepts an e-mail address and a password as input and validates it using the following methods (Please note, this is not all-inclusive.):

For the E-Mail Address:

Best practice for validating an email address:

• It is case sensitive in the local portion of the address (left of the rightmost @ character)
• Has non-alphanumeric characters in the local-part (including + and @)
• Has zero or more labels
• Check for presence of at least one @ symbol in the address

For Passwords:

You will need to make sure that all passwords meet the company's criteria.

• Data Type validation
• Format validation
• That the password has at least 10 characters, 1 upper case, 1 lower case, 1 number between 1 and 20.
• That it doesn't use semicolons or quotes.

Answer 1

HI

Please find the code below to validate email and password respectively

I made a console application to demonstrate the validation process

// program class
class Program
{
// main function
static void Main(string[] args)
{
Console.WriteLine("Please enter Email");
string Email = Console.ReadLine();
Console.WriteLine("Please enter Password");
string password = Console.ReadLine();

// use the below rejex which to make sure the email is valid
string emailRegex = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
@"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
@".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
//create email rejex using above string
Regex email = new Regex(emailRegex);
// check whether email is valid or not
if (!email.IsMatch(Email))
Console.WriteLine("Email is not Correct");

// check for password length
if (password.Length < 10)
Console.WriteLine("Please use a valid password");

// use below rejex fo rvalidating password
string passwordRejet = "^[a-zA-Z0-9]*$";
Regex pass = new Regex(passwordRejet);
// check for password
if (!pass.IsMatch(password))
Console.WriteLine("Please use a valid password");

}

}

OUTPUT:

Thanks

Hope it helps!!