Regex in C# for Email and Password

Email Regex

 var regexPattern = @"^(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"
     + @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?
				[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."
     + @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?
				[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"
     + @"([a-zA-Z0-9]+[\w-]+\.)+[a-zA-Z]{1}[a-zA-Z0-9-]{1,23})$";

var regexPattern = @"^(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"

+ @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?

[0-9]{1,2}|25[0-5]|2[0-4][0-9])\."

+ @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?

[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"

+ @"([a-zA-Z0-9]+[\w-]+\.)+[a-zA-Z]{1}[a-zA-Z0-9-]{1,23})$";

Password

private bool ValidatePassword(string password, out string ErrorMessage)
{
    var input = password;
    ErrorMessage = string.Empty;

    if (string.IsNullOrWhiteSpace(input))
    {
        throw new Exception("Password should not be empty");
    }

    var hasNumber = new Regex(@"[0-9]+");
    var hasUpperChar = new Regex(@"[A-Z]+");
    var hasMiniMaxChars = new Regex(@".{8,15}");
    var hasLowerChar = new Regex(@"[a-z]+");
    var hasSymbols = new Regex(@"[!@#$%^&*()_+=\[{\]};:<>|./?,-]");

    if (!hasLowerChar.IsMatch(input))
    {
        ErrorMessage = "Password should contain At least one lower case letter";
        return false;
    }
    else if (!hasUpperChar.IsMatch(input))
    {
        ErrorMessage = "Password should contain At least one upper case letter";
        return false;
    }
    else if (!hasMiniMaxChars.IsMatch(input))
    {
        ErrorMessage = "Password should not be less than or greater than 12 characters";
        return false;
    }
    else if (!hasNumber.IsMatch(input))
    {
        ErrorMessage = "Password should contain At least one numeric value";
        return false;
    }

    else if (!hasSymbols.IsMatch(input))
    {
        ErrorMessage = "Password should contain At least one special case characters";
        return false;
    }
    else
    {
        return true;
    }
}

private bool ValidatePassword(string password, out string ErrorMessage)

{

var input = password;

ErrorMessage = string.Empty;

if (string.IsNullOrWhiteSpace(input))

{

throw new Exception("Password should not be empty");

}

var hasNumber = new Regex(@"[0-9]+");

var hasUpperChar = new Regex(@"[A-Z]+");

var hasMiniMaxChars = new Regex(@".{8,15}");

var hasLowerChar = new Regex(@"[a-z]+");

var hasSymbols = new Regex(@"[!@#$%^&*()_+=\[{\]};:<>|./?,-]");

if (!hasLowerChar.IsMatch(input))

{

ErrorMessage = "Password should contain At least one lower case letter";

return false;

}

else if (!hasUpperChar.IsMatch(input))

{

ErrorMessage = "Password should contain At least one upper case letter";

return false;

}

else if (!hasMiniMaxChars.IsMatch(input))

{

ErrorMessage = "Password should not be less than or greater than 12 characters";

return false;

}

else if (!hasNumber.IsMatch(input))

{

ErrorMessage = "Password should contain At least one numeric value";

return false;

}

else if (!hasSymbols.IsMatch(input))

{

ErrorMessage = "Password should contain At least one special case characters";

return false;

}

else

{

return true;

}