Why is this code wrong?

Question

Hi everyone. Can someone tell me why moderators have declined this submission?

What is the output of this code?

import re

pattern = r".([aeiou](36)*(4)?(5)+)+(z)8

Answer 1

Out of 24 quizzes only 2 of mine got accepted

Answer 2

but how they decide if accept or decline a submission? The correctness of the code is not enough apparently