diff --git a/Course3/Lab4/validations.py b/Course3/Lab4/validations.py
index b18de65a2e..780b6022aa 100644
--- a/Course3/Lab4/validations.py
+++ b/Course3/Lab4/validations.py
@@ -6,19 +6,36 @@ def validate_user(username, minlen):
     """Checks if the received username matches the required conditions."""
     if type(username) != str:
         raise TypeError("username must be a string")
+
     if minlen < 1:
         raise ValueError("minlen must be at least 1")
     
     # Usernames can't be shorter than minlen
     if len(username) < minlen:
         return False
+
     # Usernames can only use letters, numbers, dots and underscores
     if not re.match('^[a-z0-9._]*$', username):
         return False
+
     # Usernames can't begin with a number
     if username[0].isnumeric():
         return False
+
+    if ' ' in username:
+        return False
+
+    if username[0] in ['.', '_']:
+        return False
+
     return True
 
 
 
+print(validate_user("blue.kale", 3)) # True
+
+print(validate_user(".blue.kale", 3)) # Currently True, should be False
+
+print(validate_user("red_quinoa", 4)) # True
+
+print(validate_user("_red_quinoa", 4)) # Currently True, should be False