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Closes: #1 #37246

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Closes: #1 #37246

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16 changes: 9 additions & 7 deletions Course3/Lab4/validations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,22 +3,24 @@
import re

def validate_user(username, minlen):
"""Checks if the received username matches the required conditions."""
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):
return False
# Usernames can't begin with a number
if username[0].isnumeric():

# First char must be a letter, rest can be letters, numbers, dots, or underscores
if not re.match('^[a-z][a-z0-9._]*$', username):
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