[Python] check50 expects exit code 0 not 1 in numb3rs.py

The problem I'm trying is cs50's introduction to programming with python problem set 7 numb3rs problem, wherein I need to check if the Ip address entered is a valid Ip address or not. The thing is check50 gives me three error messages that I do not understand. These are the three errors:

correct numb3rs.py passes all test_numb3rs.py checks
expected exit code 0, not 1
:| test_numb3rs.py catches numb3rs.py only checking if first byte of IPv4 address is in range
can't check until a frown turns upside down
:| test_numb3rs.py catches numb3rs.py accepting expecting five-byte IPv4 address
can't check until a frown turns upside down


import re

def main():

print(validate(input("IPv4 Address: ")))

def validate(ip):
address = "(0|[1-9]|[1-9][0-9]|[1-2][0-5][0-5]|1[0-9][0-9]|2[0-4][0-9])"
if re.search(fr'^{address}\.{address}\.{address}\.{address}$', ip):
return "True"
else:
return "False"

if __name__ == "__main__":
main()


This is the code. I tried using sys to exit the program after print but that does not work. I also tried returning True and False as bools but that also didn't work. I also did a test_numb3rs.py as the problem asked for it and checked everything(All bytes, if user input was not an Ip address, and so on).

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