Swift 5 - Error with the password validation regex

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))"

Artyom Vancyan · Accepted Answer · 2022-07-14 05:53:56Z

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

edited Jul 14, 2022 at 5:53

answered Jul 14, 2022 at 5:48

Artyom Vancyan

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Comments

Zeeshan Ahmad II · Accepted Answer · 2022-07-14 05:37:30Z

0

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

answered Jul 14, 2022 at 5:37

Zeeshan Ahmad II

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Comments

Samir Bagaria · Accepted Answer · 2022-07-14 05:59:44Z

0

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/

edited Jul 14, 2022 at 5:59

answered Jul 14, 2022 at 5:49

Samir Bagaria

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