diff --git a/Course3/Lab4/validations.py b/Course3/Lab4/validations.py
index b18de65a2e..fa13001ec1 100644
--- a/Course3/Lab4/validations.py
+++ b/Course3/Lab4/validations.py
@@ -1,24 +1,43 @@
+
+
+
+
 #!/usr/bin/env python3
 
 import re
 
+
+
 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._]*$', username):
-        return False
-    # Usernames can't begin with a number
-    if username[0].isnumeric():
+
+    if not re.match(r'^[a-z][a-z0-9._]*$', username, re.IGNORECASE):
+
         return False
+
     return True
 
 
 
+print(validate_user("blue.kale", 3))
+
+print(validate_user(".blue.kale", 3))
+
+print(validate_user("_red_quinoa", 4))
+
+print(validate_user("red_quinoa", 4))
+
+print(validate_user("7grain", 3))
+
+