Swift 5 - Error with the password validation regex - ios

Question

I am making a sign-in/up function on Swift. I am trying to validate a password using regex. The passwords have the following requirements
At least 7 characters long
At least one uppercase letter
At least one number
This is the validation regex I was using: "^(?=.[A-Z])(?=.[0-9]){7}$"
And this is my code
let passwordTest = NSPredicate(format: "SELF MATCHES %#", "^(?=.[A-Z])(?=.[0-9]){7}$")
Whenever I try to log in with a password that meets these requirements (eg. Greatpass13), Xcode gives me an error saying
Thread 1: "Can't do regex matching, reason: (Can't open pattern U_REGEX_RULE_SYNTAX (string Greatpass13, pattern ^(?=.[A-Z])(?=.[0-9]){7}$, case 0, canon 0))"

Answer 1

(?=^.{7,}$)(?=^.*[A-Z].*$)(?=^.*\d.*$).*
Short Explanation
(?=^.{7,}$) At least 7 characters long
(?=^.*[A-Z].*$) At least one uppercase letter
(?=^.*\d.*$) At least one number
.* Match the string that contains all assertions
See the regex demo
Swift Example
let phonePattern = #"(?=^.{7,}$)(?=^.*[A-Z].*$)(?=^.*\d.*$).*"#
func isValid(password: String) -> Bool {
return password.range(
of: phonePattern,
options: .regularExpression
) != nil
}
print(isValid(password: "Pass1")) // false
print(isValid(password: "Pass23word")) // true
print(isValid(password: "23password")) // false
print(isValid(password: "Greatpass13")) // true

Answer 2

you forgot to add dot before counter 7
func isValidPassword() -> Bool {
let password = self.trimmingCharacters(in: CharacterSet.whitespaces)
let passwordRegx = "^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9]).{7}$"
let passwordCheck = NSPredicate(format: "SELF MATCHES %#",passwordRegx)
return passwordCheck.evaluate(with: password)
}
at least one uppercase,
at least one digit
at least one lowercase
min 7 characters total

Answer 3

Here is the updated regex based on yours.
let passwordRegx = "^(?=.*?[A-Z])(?=.*?[0-9]).{7,}$"
let passwordPredicate = NSPredicate(format: "SELF MATCHES %#",passwordRegx)
Also you need to add {7,} at the end otherwise it will only match for 7 characters and not more than that.
You can test your regex at:
https://regex101.com/