Closes: #1

Course3/Lab4/validations.py

@@ -12,13 +12,16 @@ def validate_user(username, minlen):
     # Usernames can't be shorter than minlen
     if len(username) < minlen:
         return False
-    # Usernames can only use letters, numbers, dots and underscores
+    # Usernames can only use lowercase 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():
+    # Usernames must start with a letter
+    if not username[0].isalpha():
         return False
     return True
 
-
-
+# Test cases
+print(validate_user("blue.kale", 3))      # True
+print(validate_user(".blue.kale", 3))     # False
+print(validate_user("red_quinoa", 4))     # True
+print(validate_user("_red_quinoa", 4))    # False