hackerrank-java/src/ValidUsernameRegularExpression.java at master · Irish011/hackerrank-java · GitHub

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// https://www.hackerrank.com/challenges/valid-username-checker/problem

import java.util.Scanner;

public class ValidUsernameRegularExpression {

private static final Scanner scanner = new Scanner(System.in);

public static void main(String[] args) {

int n = Integer.parseInt(scanner.nextLine());

while (n-- != 0) {

String userName = scanner.nextLine();

if (userName.matches(UsernameValidator.regularExpression)) {

System.out.println("Valid");

} else {

System.out.println("Invalid");

}

private static class UsernameValidator {

public static final String regularExpression = "([A-Z]|[a-z])\\w{7,29}";

}

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