Improve username behavior

Course3/Lab4/validations.py

@@ -1,24 +1,24 @@
-#!/usr/bin/env python3
-
 import re
 
 def validate_user(username, minlen):
-    """Checks if the received username matches the required conditions."""
+    """Checks if the received username matches the required conditions for first =character being letter."""
     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._]*$', username):
+    if not re.match('^[a-z0-9._]*$', username, re.IGNORECASE):
         return False
-    # Usernames can't begin with a number
-    if username[0].isnumeric():
+    # First character must be a letter
+    if not username[0].isalpha():
         return False
     return True
 
-
-
+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