Tag Content Extractor :- HackerRank Java Solution

 Problem:-

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 N,  (the number of lines). 
The   N subsequent lines each contain a line of text.

Constraints

• 1 < N < 100
• Each line contains a maximum of 104 printable characters.
• The total number of characters in all test cases will not exceed 106.

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.util.Scanner;


import java.util.regex.Matcher;


import java.util.regex.Pattern;



/* Solution assumes we can't have the symbol "<" as text between tags */


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();


            


            boolean matchFound = false;


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


            Matcher m = r.matcher(line);



            while (m.find()) {


                System.out.println(m.group(2));


                matchFound = true;


            }


            if ( ! matchFound) {


                System.out.println("None");


            }


        }


    }


}