Valid Username Regular Expression HackerRank Solution

The code is a solution to a problem where a username needs to be validated based on certain criteria. The username must start with an alphabetic character, followed by alphanumeric characters. The total length of the username must be between 8 and 30 characters. The code uses a regular expression to validate the username.

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Here is the Valid Username Regular Expression HackerRank Solution HackerRank solution using CodeRankGPT:

The solution approach is to use a regular expression that matches the required criteria for a valid username. The regular expression '^[A-Za-z]\w{7,29}$' ensures that the username starts with an alphabetic character, followed by 7 to 29 alphanumeric characters. The 'matches' method of the String class is used to check if the input username matches the regular expression. If it does, 'Valid' is printed, otherwise 'Invalid' is printed.


/**
 * 
 */
package com.javaaid.hackerrank.solutions.languages.java.strings;

import java.util.Scanner;

/**
 *
 */
 class UsernameValidator {

	public static final String regularExpression = "^[A-Za-z]\\w{7,29}$";;

}

public class ValidUsernameRegularExpression {
	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");
			}
		}
	}
}

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Here is the Valid Username Regular Expression HackerRank Solution HackerRank solution using CodeRankGPT:

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