func isValidPassword(password: String) -> Bool {
 let pattern =  "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d]{2,}"
 let regexText_1 = NSPredicate(format: "SELF MATCHES %@", pattern)
 let result_1 = regexText_1.evaluate(with: password)
 return result_1
}

print(isValidPassword(password: "3213aA")) \ true
print(isValidPassword(password: "3213aA!")) \ false