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  1. Prepare
  2. Java
  3. Strings
  4. Valid Username Regular Expression
  5. Discussions

Valid Username Regular Expression

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483 Discussions

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  • temgirerushikes1
     + 0 comments
    import java.util.Scanner;
class UsernameValidator {
    public static final String regularExpression = "^[a-zA-Z][a-zA-Z0-9_]{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");
            }           
        }
    }
}

  • yashdeora98294
     + 0 comments

    Here is Valid Username Regular Expression Java solution - https://programmingoneonone.com/hackerrank-valid-username-regular-expression-solution-in-java.html

  • 236sakshisingh
     + 0 comments

    public static final String regularExpression = "^[a-zA-Z][\w]{7,29}$";

  • devashis_k2002
     + 0 comments
        public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int size = scanner.nextInt();
        scanner.nextLine();
        for (int i = 0; i < size; i++) {
            System.out.println(scanner.nextLine().matches("[a-zA-Z][a-zA-Z0-9_]{7,29}") ? "Valid" : "Invalid");
        }
        scanner.close();
    }

  • vitalii_iandulov
     + 0 comments
    public static final String regularExpression = "[A-Za-z]\\w{7,29}";