Question

Using the Java Regular Expressions API, design a class that validates the format of a user input password. Specifically, you will use regular expressions to validate the syntax format and length of a password set by a user.

This included ensuring the password meets specific criteria, such as:

• Longer than a total of 8 characters

• Contains at least 1 one the following special characters: !, @, #, $, %

• Contains 1 or more numbers

• Create 1 final criteria of your own design. For example, maybe the password set cannot contain the word Password.

Be sure to document in your code’s comments and your project write-up.

Answer 1

    import java.util.Scanner;
    public class Main {
      public static void main(String[] args) {
          System.out.println("Welcome to Password Validate \n\n ");
          System.out.println("Rules for a valid Password: \n Longer than a total of 8 characters \nContains at least 1 one the following special characters: !, @, #, $, % \n Contains 1 or more numbers \n Should Contain Capital Character");
           System.out.println("Please Enter your Password :");
        Scanner sc = new Scanner(System.in);
        String s1 = sc.nextLine(); // Gets the password string from used
            boolean n = Validate.isValid(s1); // Validate class will validate the Regex Requirements
            if(n){
             System.out.println("Entered a Valid password");
            }else{
             System.out.println("Invalid password");
            }
      }
    }
    class Validate {
     
        // Below function validates the Rules
        public static boolean isValid(String password){
    if(password.matches(".*[0-9]{1,}.*") && password.matches("((?=.*[A-Z])")&&password.matches(".*[!@#$%]{1,}.*") && password.length()>=8 && password.length()<=20)
                        { //if it matches or passes all rules returns true
                                        return true;
                        }
                        else
                        {
                                        return false;
                        }
           }
        }