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Closes: #1 #36693

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Closes: #1 #36693

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13 changes: 8 additions & 5 deletions Course3/Lab4/validations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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