Can't Do Regex Matching

I am creating my signup page by following the Firebase Authentication Tutorial 2020 and on my signup page, whenever I click create account without anything in any of the fields, my app crashes. Error code is: “Thread 1: Exception: “Can’t do regex matching, reason: (Can’t open pattern U_REGEX_RULE_SYNTAX (string , pattern ^(?=.[a-z])(?=.[A-Z])(?=.*\d)a-zA-z\d{8,32}$, case 0, canon 0))”” on the AppDelegate.swift file.
This is my code for the password validity check:

static func isPasswordValid(_ password : String) -> Bool {

    let passwordTest = NSPredicate(format: "SELF MATCHES %@", "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[a-zA-z\\d](?=.*[0-9]){8,32}$")
    return passwordTest.evaluate(with: password)
}

}

This is my code for the signup page:

import UIKit
import FirebaseAuth
import Firebase
import FirebaseFirestore

class SignUpP1ViewController: UIViewController {

@IBOutlet weak var FirstNameTextField: UITextField!

@IBOutlet weak var LastNameTextField: UITextField!

@IBOutlet weak var EmailTextField: UITextField!

@IBOutlet weak var PasswordTextField: UITextField!

@IBOutlet weak var ConfirmPasswordTextField: UITextField!

@IBOutlet weak var ContinueButton: UIButton!

@IBOutlet weak var AlreadyhaveaccountButton: UIButton!

@IBOutlet weak var ErrorLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    let toolBar = UIToolbar ()
    
    toolBar.sizeToFit()
    
    let flexibleSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: nil, action: nil)
    
    let doneButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.done, target: self, action: #selector(self.doneClicked))
    
    toolBar.setItems([flexibleSpace, doneButton], animated: true)
    
    FirstNameTextField.inputAccessoryView = toolBar
    
    LastNameTextField.inputAccessoryView = toolBar
    
    EmailTextField.inputAccessoryView = toolBar
    
    PasswordTextField.inputAccessoryView = toolBar
    
    ConfirmPasswordTextField.inputAccessoryView = toolBar
    
    // Do any additional setup after loading the view.
    setUpElements()
}

@objc func doneClicked() {
    
    view.endEditing(true)
    
}

func setUpElements() {
    
    ErrorLabel.alpha = 0
    
    //Utilities.styleFilledButton(ContinueButton)
    
    //Utilities.styleFilledButton(AlreadyhaveaccountButton)
    
}

func validateFields() -> String? {
   
    if let FirstNameEmpty = FirstNameTextField.text, !FirstNameEmpty.isEmpty
    {
            return "Please fill in all fields"
        }
        /*
        !(FirstNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)! ||
        !(LastNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)! ||
        !(EmailTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)! ||
        !(PasswordTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)! ||
        !(ConfirmPasswordTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)!
        */
        

            
            let cleanedPassword = PasswordTextField.text!
    //.trimmingCharacters(in: .whitespacesAndNewlines)
             
        if Utilities.isPasswordValid(cleanedPassword) == false {
                return "Password has to have at minimum 1 capital letter, 1 lowercase letter, 1 number, and be between 8-32 characters"
            }
           return nil
            
        }
    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

    
@IBAction func ContinueButtonTapped(_ sender: Any) {

        let error = validateFields()
        
        if error != nil{
            showError(error!)
        }
            
        else {
            
            let firstname = FirstNameTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
            
            let lastname = LastNameTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
            
            let email = EmailTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
            
            let password = PasswordTextField.text!.trimmingCharacters(in: .whitespacesAndNewlines)
            
            
            
            Auth.auth().createUser(withEmail: email, password: password) { (result, err) in
                
                if err != nil {
                    self.showError("Error creating user")
                }
                else {
                   
                    let db = Firestore.firestore()
                    
                    db.collection("users").addDocument(data: ["firstname":firstname, "lastname":lastname, "uid": result!.user.uid ]) { (error) in
                    
                        if error != nil {
                            self.showError("Error saving user data, please contact support")
                        }
                    }
                    
                    self.transitionToHome()
                    
                }
            }
        }
    }

@IBAction func AlreadyhaveaccountTapped(_ sender: Any) {
}

func showError(_ message: String) {
    ErrorLabel.text = message
    ErrorLabel.alpha = 1
}

func transitionToHome() {
    
   let homeViewController = storyboard?.instantiateViewController(identifier: Constants.Storyboard.homeViewController) as? HomeViewController
    
    view.window?.rootViewController = homeViewController
    
    view.window?.makeKeyAndVisible()
    
}

}

Your regex is messed up. You have a quantifier {8,32} after a lookahead expression (?=.*[0-9]) and that is meaningless. Remove that lookahead and try again.