Python Course, Phone Number Validator Question - What could "test case 3 be"?

Question

Hi, I wrote this code as an answer:
import re
#your code goes here
pattern = r"\A(1|8|9)\d{7}"
number = input()

if re.match(pattern, number):
print("Valid")
else:
print("Invalid")

(not working) r"\A(1|8|9)\d{7}"
(works) r"\A(1|8|9)\d{7}

Answer 1

$ mean end of text, that after 7 digitals (d{7}) no more text or nums

Answer 2

U need mark start of string too by ^, but u use \A (for text)