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  1. Prepare
  2. Java
  3. Strings
  4. Java Regex 2 - Duplicate Words
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Java Regex 2 - Duplicate Words

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  • kavib9345
     + 0 comments
    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();
    }
}

  • nlasarte
     + 1 comment

    Yes I'm generating the expected ouput but test still fail

  • gavrielmrudolph
     + 0 comments

    this is broken

  • cerodi91
     + 0 comments

    String regex = "\b(\w+)(\b\W+\b\1\b)*"; Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE); input = input.replaceAll("\b" + Pattern.quote(m.group()) + "\b", m.group(1));

    The Pattern.quote method quotes part of a regex pattern to make regex interpret it as string literals.

  • dineshkumar25
     + 0 comments

    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(0),m.group(1))**;
        }

        // Prints the modified sentence.
        System.out.println(input);
    }

    in.close();
}

    }