Stuck with the regex quiz in Python

Question

The code passes all five tests except the third one which i Can not see since i'm not a pro membre. I couldn't find the error.
#You are given a number input, and need to check if it is a valid phone number.
#A valid phone number has exactly 8 digits and starts with 1, 8 or 9.
#Output "Valid" if the number is valid and "Invalid", if it is not.
#Sample Input
#81239870
#Sample Output
#Valid
import re
number = str(input()).replace(" ", "")
number = number.strip()
pattern = "^([189])(\d){7}"
match = re.match( pattern , number )
if match :
print("Valid")
else :
print("Invalid")

Answer 1

One advice==> Don't make simple problems complex as the chances of getting an error increases.
Question asks us to write logic for 2 conditions.
1. It should start with 1|8|9
2. It should have exactly 8 numbers. Excluding the first num, it will have 7.
Write a regex pattern satisfying these two conditions.
pattern = r"^[189]\d{7}quot;
You are done.
remove that replace and strip method, they are unessential here. Simply add one $ at the end to specify the end point

Answer 2

Thanks for your answers.
I forfait the $ metacharacter , so my pattern allowed for more than 8 digits.

Answer 3

Hint: In your code 123456789 or 9876543210-1-2-3+4 was valid too, it's wrong.