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Closes: #1 #37260

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Closes: #1 #37260

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17 changes: 14 additions & 3 deletions Course3/Lab4/validations.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
#!/usr/bin/env python3


import re

def validate_user(username, minlen):
Expand All @@ -12,13 +13,23 @@ 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
if not re.match('^[a-z0-9._]*$', username):

# 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

# Usernames can't begin with a dot or underscore
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