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Closes: #1 #36775

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Closes: #1 #36775

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15 changes: 10 additions & 5 deletions Course3/Lab4/validations.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
#!/usr/bin/env python3

import re

pattern = r'^[a-z0-9._]+$'

def validate_user(username, minlen):
"""Checks if the received username matches the required conditions."""
if type(username) != str:
Expand All @@ -13,12 +14,16 @@ def validate_user(username, 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(pattern, username):
return False
# Usernames can't begin with a number
if username[0].isnumeric():
# Usernames can't begin with a number, dots or underscores
if username[0].isnumeric() or username[0] in '._':
return False
return True

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