Tag Content Extractor

 In a tag-based language like XML or HTML, contents are enclosed between a start tag and an end tag like <tag>contents</tag>. Note that the corresponding end tag starts with a /.

Given a string of text in a tag-based language, parse this text and retrieve the contents enclosed within sequences of well-organized tags meeting the following criterion:

1. The name of the start and end tags must be same. The HTML code <h1>Hello World</h2> is not valid, because the text starts with an h1 tag and ends with a non-matching h2 tag.

2. Tags can be nested, but content between nested tags is considered not valid. For example, in <h1><a>contents</a>invalid</h1>, contents is valid but invalid is not valid.

3. Tags can consist of any printable characters.

Input Format

The first line of input contains a single integer,  (the number of lines).
The  subsequent lines each contain a line of text.

Constraints

• Each line contains a maximum of  printable characters.
• The total number of characters in all test cases will not exceed .

Output Format

For each line, print the content enclosed within valid tags.
If a line contains multiple instances of valid content, print out each instance of valid content on a new line; if no valid content is found, print None.

Sample Input

4
<h1>Nayeem loves counseling</h1>
<h1><h1>Sanjay has no watch</h1></h1><par>So wait for a while</par>
<Amee>safat codes like a ninja</amee>
<SA premium>Imtiaz has a secret crush</SA premium>

Sample Output

Nayeem loves counseling
Sanjay has no watch
So wait for a while
None
Imtiaz has a secret crush

Solution:

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 t = Integer.parseInt(in.nextLine());
      
      while(t-->0){
          String line = in.nextLine();
         
          Matcher m = Pattern.compile("<(.+)>(([^<>]+))</\\1>").matcher(line);
          
          if (!m.find()) {
              System.out.println("None");
              continue;
          }
          
          m.reset();
          while (m.find()){
              System.out.println(m.group(2));
          }
       }
    }
 }