Java Regex 2 - Duplicate Words

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    import java.util.Scanner;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    public class DuplicateWords {
    
        public static void main(String[] args) {
    
            String regex = "\\b(\\w+)(\\s\\1\\b)+";
            Pattern p = Pattern.compile(regex,Pattern.CASE_INSENSITIVE);
    
            Scanner in = new Scanner(System.in);
            int numSentences = Integer.parseInt(in.nextLine());
            
            while (numSentences-- > 0) {
                String input = in.nextLine();
                
                Matcher m = p.matcher(input);
                
                // Check for subsequences of input that match the compiled pattern
                while (m.find()) {
                    input = input.replaceAll(m.group(),m.group(1));
                }
                
                // Prints the modified sentence.
                System.out.println(input);
            }
            
            in.close();
        }
    }