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  1. Prepare
  2. Regex
  3. Applications
  4. Detect HTML Tags
  5. Discussions

Detect HTML Tags

  • preethiannjacob
     + 1 comment

    Java 15

    import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Solution {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt(); scanner.nextLine();
        //one or more spaces before tagname. So \\s*
        Pattern pattern = Pattern.compile("<\\s*(\\w+)[^>]*>");
        TreeSet<String> tags = new TreeSet<String>();
        for(int i=0;i<n;i++)
        {   Matcher matcher = pattern.matcher(scanner.nextLine());
            while(matcher.find())   tags.add(matcher.group(1));
        }
        System.out.println(String.join(";",tags));
    }
}