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In this post, you will find the solution for Valid Username Regular Expression-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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JAVA was developed by James Gosling at Sun Microsystems Inc in the year 1991, later acquired by Oracle Corporation. It is a simple programming language. Java makes writing, compiling, and debugging programming easy. It helps to create reusable code and modular programs.
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Link for the Problem – Valid Username Regular Expression – Hacker Rank Solution
Valid Username Regular Expression – Hacker Rank Solution
Objective
You are updating the username policy on your company’s internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied:
- The username consists of to characters inclusive. If the username consists of less than 8 or greater than 30 characters, then it is an invalid username.
Problem Statement: Click Here
Valid Username Regular Expression – Hacker Rank Solution
import java.util.Scanner; class UsernameValidator { public static final String regularExpression = "^[a-zA-Z][\\w]{7,29}$"; } public class Solution { private static final Scanner scan = new Scanner(System.in); public static void main(String[] args) { int n = Integer.parseInt(scan.nextLine()); while (n-- != 0) { String userName = scan.nextLine(); if (userName.matches(UsernameValidator.regularExpression)) System.out.println("Valid"); else System.out.println("Invalid"); } } }