Problem with phone number validator task in regular expressions module In python

Question

I got a problem with the phone number validator assignment in the regular expressions module in python. My code works with all test cases except number 3 and I am not sure why. I would appreciate some ideas. https://code.sololearn.com/c0CLk42nh4Vj/?ref=app

Answer 1

it may need '^' and '#x27; to specify the beggining and end

Answer 2

Although, I don't get the logic behind it, specifying the end worked. Thanks