Do this programming assignment in Java Programming. 1) [10 points] Write a progr

Question

Do this programming assignment in Java Programming.

1) [10 points] Write a program that validates entered username, password, email address, and phone number (for example, 313-456-7890). Password must have at least one capital letter, one lowercase letter, one digit, one underscore character, and should contain at least 6 characters. Username might contain digits, letters (lowercase only), and underscore symbols, but no spaces in the name Note 1: You should use regular expressions for a validation. Note 2: To check if the password have at least one digit you can use "positive lookahead" statement: (-*[0-9]) Expected output Enter username: username 123 Enter password: 123-Wtyi Enter email address: ake.ematlwgmatl.com Enter phone number 111-333-4444 Valid username! Valid password Valid email address! Valid phone number!

Explanation / Answer

import java.io.*;
import java.util.*;

public class DemoRegular {

  

   public static void main(String[] args){
       
        Scanner sc = new Scanner(System.in);
       
        System.out.println("Enter password :");
        String passwd = sc.nextLine();
        String pattern1 = "(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[-])(?=\S+$).{6,}";
        if (passwd.matches(pattern1)){
            System.out.println("Valid input");
        }
        else {
            System.out.println("Invalid input");
        }
       
        String pattern2 = "(?=.*[a-z])(?=.*[_])(?=\S+$).{1,}";
       
        System.out.println("Enter username :");
        String username = sc.nextLine();
        if (username.matches(pattern2)){
            System.out.println("Valid input");
        }
        else {
            System.out.println("Invalid input");
        }
       
        String pattern3 = "(?=.*[0-9])(?=.*[-])(?=\S+$).{12,}";
        System.out.println("Enter phone :");
        String phone = sc.nextLine();
        if (phone.matches(pattern3)){
            System.out.println("Valid input");
        }
        else {
            System.out.println("Invalid input");
        }
       
        String pattern4 = "(?=.*[@])(?=\S+$).{1,}";
        System.out.println("Enter e-mail :");
        String email = sc.nextLine();
        if (email.matches(pattern4)){
            System.out.println("Valid input");
        }
        else {
            System.out.println("Invalid input");
        }

       
     
   }
}

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