Why is it so simple and so unreasonable. I need to answer the code integration!

Question

https://code.sololearn.com/cAGBJ71T7ciQ/?ref=app

Answer 1

What exactly is it you need? Code appears functional with no errors.

Answer 2

it is explained very good in regular expresion section in python lessons

https://www.sololearn.com/learn/Python/2480/ Metacharacters