Here is Tag Content Extractor solution in Java - https://programmingoneonone.com/hackerrank-tag-content-extractor-solution-in-java.html

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Pattern pattern = Pattern.compile("<([^<>]+)>([^<>]+)<\/\1>");

this works for me after retry and refreshing the page sevaral time

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

public class Solution{ 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();
        Pattern pattern = Pattern.compile("<(.+)>([^<]+)</\\1>");
        Matcher matcher = pattern.matcher(line);
        boolean found = false;
        while (matcher.find()){
            System.out.println(matcher.group(2));
            found = true;
        }
        if(!found){
            System.out.println("None");
        }
        //Write your code here

        testCases--;
    }
}

}