Altered regex

src/main/java/seedu/address/model/person/Email.java

@@ -10,6 +10,12 @@
 public class Email {
 
     private static final String SPECIAL_CHARACTERS = "+_.-";
+    //  alphanumeric and special characters
+    private static final String ALPHANUMERIC_NO_UNDERSCORE = "[^\\W_]+"; // alphanumeric characters except underscore
+    private static final String LOCAL_PART_REGEX = "^" + ALPHANUMERIC_NO_UNDERSCORE + "([" + SPECIAL_CHARACTERS + "]"
+                + ALPHANUMERIC_NO_UNDERSCORE + ")*";
+    public static final String VALIDATION_REGEX = LOCAL_PART_REGEX + "@" + "([a-zA-Z]+\\.)+[a-zA-Z]{2,6}$";
+
     public static final String MESSAGE_CONSTRAINTS = "Emails should be of the format local-part@domain "
             + "and adhere to the following constraints:\n"
             + "1. The local-part should only contain alphanumeric characters and these special characters, excluding "
@@ -18,21 +24,13 @@ public class Email {
             + "2. This is followed by a '@' and then a domain name. The domain name is made up of domain labels "
             + "separated by periods.\n"
             + "The domain name must:\n"
-            + "    - end with a domain label at least 2 characters long\n"
-            + "    - have each domain label start and end with alphanumeric characters\n"
-            + "    - have each domain label consist of alphanumeric characters, separated only by hyphens, if any.";
-    // alphanumeric and special characters
-    private static final String ALPHANUMERIC_NO_UNDERSCORE = "[^\\W_]+"; // alphanumeric characters except underscore
-    private static final String LOCAL_PART_REGEX = "^" + ALPHANUMERIC_NO_UNDERSCORE + "([" + SPECIAL_CHARACTERS + "]"
-            + ALPHANUMERIC_NO_UNDERSCORE + ")*";
-    private static final String DOMAIN_PART_REGEX = ALPHANUMERIC_NO_UNDERSCORE
-            + "(-" + ALPHANUMERIC_NO_UNDERSCORE + ")*";
-    private static final String DOMAIN_LAST_PART_REGEX = "(" + DOMAIN_PART_REGEX + "){2,}$"; // At least two chars
-    private static final String DOMAIN_REGEX = "(" + DOMAIN_PART_REGEX + "\\.)*" + DOMAIN_LAST_PART_REGEX;
-    public static final String VALIDATION_REGEX = LOCAL_PART_REGEX + "@" + DOMAIN_REGEX;
+            + "    - end with a domain label that is between 2 to 6 characters (e.g. .com, .edu)\n"
+            + "    - have each domain label start and end with characters only\n";
+
 
     public final String value;
 
+
     /**
      * Constructs an {@code Email}.
      *

src/test/java/seedu/address/model/person/EmailTest.java

@@ -52,27 +52,26 @@ public void isValidEmail() {
         assertFalse(Email.isValidEmail("[email protected]")); // domain name starts with a hyphen
         assertFalse(Email.isValidEmail("[email protected]")); // domain name ends with a hyphen
         assertFalse(Email.isValidEmail("[email protected]")); // top level domain has less than two chars
+        assertFalse(Email.isValidEmail("test@localhost")); // alphabets only
+        assertFalse(Email.isValidEmail("123@145")); // numeric domain name
+        assertFalse(Email.isValidEmail("[email protected]")); // mixture of alphanumeric and special characters
+        assertFalse(Email.isValidEmail("[email protected]")); // domain name has symbols
 
         // valid email
         assertTrue(Email.isValidEmail("[email protected]")); // underscore in local part
         assertTrue(Email.isValidEmail("[email protected]")); // period in local part
         assertTrue(Email.isValidEmail("[email protected]")); // '+' symbol in local part
         assertTrue(Email.isValidEmail("[email protected]")); // hyphen in local part
-        assertTrue(Email.isValidEmail("a@bc")); // minimal
-        assertTrue(Email.isValidEmail("test@localhost")); // alphabets only
-        assertTrue(Email.isValidEmail("123@145")); // numeric local part and domain name
-        assertTrue(Email.isValidEmail("[email protected]")); // mixture of alphanumeric and special characters
-        assertTrue(Email.isValidEmail("[email protected]")); // long domain name
         assertTrue(Email.isValidEmail("[email protected]")); // long local part
         assertTrue(Email.isValidEmail("[email protected]")); // more than one period in domain
     }
 
     @Test
     public void equals() {
-        Email email = new Email("valid@email");
+        Email email = new Email("valid@email.com");
 
         // same values -> returns true
-        assertTrue(email.equals(new Email("valid@email")));
+        assertTrue(email.equals(new Email("valid@email.com")));
 
         // same object -> returns true
         assertTrue(email.equals(email));
@@ -84,7 +83,7 @@ public void equals() {
         assertFalse(email.equals(5.0f));
 
         // different values -> returns false
-        assertFalse(email.equals(new Email("other.valid@email")));
+        assertFalse(email.equals(new Email("other.valid@email.com")));
     }
 
     @Test