Implement findDate method

src/main/java/BonusExercises.java

@@ -20,7 +20,7 @@ public class BonusExercises {
             - Each segment (between dots) must follow same hyphen rules
      */
     public boolean validateEmail(String email) {
-        String regex = "^[a-zA-z0-9_+-]+(?:\\.[a-zA-Z0-9_+-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z0-9-]+$"; // todo
+        String regex = "^[a-zA-z0-9_+-]+(?:\\.[a-zA-Z0-9_+-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z0-9-]+$";
         Pattern pattern = Pattern.compile(regex);
         Matcher matcher = pattern.matcher(email);
 
@@ -39,7 +39,15 @@ public class BonusExercises {
         If no match for a date is found in the string, return null.
     */
     public String findDate(String string) {
-        // todo
+        String regex1 = "(0[1-9]|1[0-2])\\/(0[1-9]|[12][0-9]|30)\\/\\d{4}|(0[1-9]|[12][0-9]|30)\\/(0[1-9]|1[0-2])\\/\\d{4}";
+        String regex2 = "(\\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|30))";
+        String regex3 = "(\\d{4}\\/(0[1-9]|1[0-2])\\/(0[1-9]|[12][0-9]|30))";
+        Pattern pattern = Pattern.compile(regex1 + "|" + regex2 + "|" + regex3);
+        Matcher matcher = pattern.matcher(string);
+
+        if(matcher.find()){
+            return matcher.group();
+        }
         return null;
     }