email validation

src/main/java/hs/fulda/de/ci/exam/project/EmailNotification.java

@@ -1,5 +1,7 @@
 package hs.fulda.de.ci.exam.project;
 
+import java.util.regex.Pattern;
+
 public class EmailNotification extends Notification {
     String email;
     String content;
@@ -19,6 +21,14 @@ public class EmailNotification extends Notification {
     }
 
     private boolean isValidEmail(String email) {
-        return true;
+        String regexPattern = "^(?=.{1,64}@)[A-Za-z0-9_-]+(\\.[A-Za-z0-9_-]+)*@"
+                + "[^-][A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*(\\.[A-Za-z]{2,})$";
+        return patternMatches(email, regexPattern);
+    }
+
+    public static boolean patternMatches(String emailAddress, String regexPattern) {
+        return Pattern.compile(regexPattern)
+                .matcher(emailAddress)
+                .matches();
     }
 }

src/test/java/hs/fulda/de/ci/exam/project/NotificationTest.java

@@ -6,6 +6,13 @@ import static hs.fulda.de.ci.exam.project.ReservationStatus.Confirmed;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class NotificationTest {
+    @Test
+    public void emailValidiationShouldReturnTrueForValidEmail(){
+        EmailNotification email = new EmailNotification("test@gmail.com", "HelloWorld");
+        boolean result = email.sendNotification();
+        assertTrue(result);
+    }
+
     @Test
     public void emailNotificationShouldBeSentWhenFlighReservationCompleted() {
         FlightReservation reservation = new FlightReservation();