Special character for validation.

[DataType(DataType.Password, ErrorMessage = "Password must be nice")]

[RegularExpression(@"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)\S{6,128}$", ErrorMessage = "Minimum 6 Max 128 characters atleast 1 Upper case Alphabet, 1 Number and 1 Special Character and avoid space")]