UniNuri (11) : 비밀번호 / 이메일 정규식(Regular Expression)

우리가 회원가입할 때 이메일에 @가 들어가야 되거나 비밀번호에 특수문자가 들어가 있는지 확인하는
정규식에 대하여 확인한다.

 

1. 이메일 형식이 맞는지 확인하는 정규식(@)

    func isValidEmail(email:String?) -> Bool {
        
        guard email != nil else {return false}
        
        let regEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        
        let pred = NSPredicate(format:"SELF MATCHES %@", regEx)
        
        return pred.evaluate(with: email)
    }

 

2. 비밀번호에 특수문자가 있는지 확인하는 정규식

    func isValidPassword(pw: String?) -> Bool {
        
        guard pw != nil else {return false}
        
        let regEx = "^(?=.*[A-Za-z])(?=.*[0-9])(?=.*[!@#$%^&*()_+=-]).{8,50}"
        
        let pred = NSPredicate(format:"SELF MATCHES %@", regEx)
        
        return pred.evaluate(with: pw)
    }

 

3. 비밀번호를 만들 때 비밀번호 확인하는 함수

    func isSamePassword(pw: String?, checkpw: String?) -> Bool{
        
        let pw = passwordTextField.text
        let checkpw = confirmPasswordTextField.text
        
        if pw == checkpw{
            return true
        }else{
            return false
        }
    }

 

 

위 세 개의 식으로 textFieldEdit 함수와 textFieldCompare 만들었다.

 // Confirm Email, Password
    @objc func textFieldEdited(textField: UITextField){
        
        if textField == emailTextField{
            if emailTextField.text?.isEmpty == false{
                if isValidEmail(email: textField.text) == true{
                    isValidEmailLabel.heightAnchor.constraint(equalToConstant: 0).isActive = true
                }
                else{
                    isValidEmailLabel.heightAnchor.constraint(equalToConstant: 15).isActive = true
                    isValidEmailLabel.text = "The email format is not valid."
                    isValidEmailLabel.textColor = .red
                }
            }
            else{
                isValidEmailLabel.heightAnchor.constraint(equalToConstant: 0).isActive = true
            }
        }
        
        else if textField == passwordTextField{
            
            
            if isValidPassword(pw: textField.text) == true{
                isValidPasswordLabel.heightAnchor.constraint(equalToConstant: 0).isActive = true
            }
            else{
                isValidPasswordLabel.heightAnchor.constraint(equalToConstant: 15).isActive = true
                isValidPasswordLabel.text = "The password format is not valid."
                isValidPasswordLabel.textColor = .red
            }
        }
    }
    
    @objc func textFieldCompare(textField: UITextField){
        if textField == confirmPasswordTextField{
            
            if isSamePassword(pw: passwordTextField.text, checkpw: confirmPasswordTextField.text) == true{
                isCorrectPasswordLabel.heightAnchor.constraint(equalToConstant: 15).isActive = true
                isCorrectPasswordLabel.text = "Password is correct"
                isCorrectPasswordLabel.textColor = .green
            }
            else{
                isCorrectPasswordLabel.heightAnchor.constraint(equalToConstant: 15).isActive = true
            }
        }
    }