This code run for intelliJ IDEA and output will be run successfully. But not for HackerRank Solution. output is generate None.

public static void main(String[] args) { // Input: Number of lines followed by the lines of text Scanner scanner = new Scanner(System.in); int n;

    try {
        n = Integer.parseInt(scanner.nextLine().trim()); // Read the number of lines
    } catch (NumberFormatException e) {
        System.out.println("Invalid input for number of lines. Please provide a valid integer.");
        return;
    }

    String[] lines = new String[n];

    for (int i = 0; i < n; i++) {
        lines[i] = scanner.nextLine(); // Read each line
    }
    scanner.close();

    // Process each line and extract valid content
    for (String line : lines) {
        if (line == null || line.isEmpty()) {
            System.out.println("None");
            continue;
        }
        extractValidContent(line);
    }
}

public static void extractValidContent(String line) {
    // Regex to match valid tags and their contents

// String regex = "<([a-zA-Z0-9\s]+)>(.*?)"; String regex = "<(.+)>([^<]+)"; Pattern pattern = Pattern.compile(regex); Matcher matcher = pattern.matcher(line); boolean found = false;

    while (matcher.find()) {
        String content = matcher.group(2);

        // Check if content is not nested
        if(content.contains("<")){
            System.out.println(content);
            found = true;
        }
    }

    if (!found) {
        System.out.println("None");
    }
}

}

For any reason the algorithm can't match this line

start tag --> bbgnEsMIM%9L=E v)f6GjSkSK6W5HWdel)VbBvZRG)#&b=+6k(O9=&C

value --> rulVew89#uyWF}4`T"xULOZ%1"5Cu)&x7qD0

end tag --> /bbgnEsMIM%9L=E v)f6GjSkSK6W5HWdel)VbBvZRG)#&b=+6k(O9=&C

I put it in Intellij and it works well but in Hackerrank page doesn't work, I found out this one in the sample test 3

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class TagExtractor {
    public static void main(String[] args){
		
		Scanner in = new Scanner(System.in);
		int testCases = Integer.parseInt(in.nextLine());
		while(testCases>0){
			String line = in.nextLine();
			
          	//Write your code here
        String tagRegex = "<(.+)>(\\w|\\d|\\s)+</\\1>";
        Pattern tagPattern = Pattern.compile(tagRegex);
        Matcher tagMatcher = tagPattern.matcher(line);

        String result = "None";
        if (tagMatcher.find()) {
          String tagName = tagMatcher.group(1);
          result = tagMatcher.group(0).replaceAll("<" + tagName + ">", "");
          result = result.substring(0, result.indexOf("<"));
        }
        System.out.println(result);

        testCases--;
		}
  }
}

For some reason I got errors.

import java.util.; import java.util.regex.;

public class Solution {

public static void main(String[] args) {
   Scanner scan = new Scanner(System.in);
    int testCases = Integer.parseInt(scan.nextLine());

    while (testCases-- > 0) {
        String line = scan.nextLine();

        Pattern r = Pattern.compile("<(.+)>([^<]+)</\\1>");
        Matcher m = r.matcher(line);

        if (m.find()){
       do {
           System.out.println(m.group(2));
           } while (m.find());
        } else{
            System.out.println("None");
            }
    }
}

}