How to verify that the password contains X uppercase letters and Y numbers?

Question

How do I verify in C# that the password contains at least X uppercase letters and at least Y numbers, and the entire string is longer than Z?

Thanks.

Answer 1

Short and clear using LINQ Where() method:

int requiredDigits = 5;
int requiredUppercase = 5;
string password = "SomE TrickY PassworD 12345";

bool isValid = password.Where(Char.IsDigit).Count() >= requiredDigits
               && 
               password.Where(Char.IsUpper).Count() >= requiredUppercase;