src/main/java/BonusExercises.java

@@ -27,7 +27,31 @@ public class BonusExercises {
         If no match for a date is found in the string, return null.
     */
     public String findDate(String string) {
-        // todo
+        //Different types of dates
+        String[] datePatterns = {
+                //American: MM/DD/YYYY
+                "\\b(0[1-9]|1[0-2])/(0[1-9]|1[0-9]|2[0-9]|3[0-1])/(\\d{4})\\b",
+
+                //British: DD/MM/YYYY
+                "\\b(0[1-9]|1[0-9]|2[0-9]|3[0-1])/(0[1-9]|1[0-2])/(\\d{4})\\b",
+
+                //ISO: YYYY-MM-DD
+                "\\b(\\d{4})-(0[1-9]|1[0-2])-(0[1-9]|1[0-9]|2[0-9]|3[0-1])\\b",
+
+                //Slash variant: YYYY/MM/DD
+                "\\b(\\d{4})/(0[1-9]|1[0-2])/(0[1-9]|1[0-9]|2[0-9]|3[0-1])\\b"
+        };
+
+        for (String pattern : datePatterns) {
+            Pattern p = Pattern.compile(pattern);
+            Matcher m = p.matcher(string);
+
+            //To return the first date
+            if (m.find()) {
+                return m.group();
+            }
+        }
+
         return null;
     }