Added 14 solutions

Java/Strings/Java Regex 2 - Duplicate Words/Solution.java

@@ -0,0 +1,31 @@
+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+)(\\W+\\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();
+    }
+}