I can't solve example in regular expressions. Help

Question

https://code.sololearn.com/cf6Z04xkEMs6/?ref=app

Answer 1

You need to add ^ at starting and $ at end for matching string forward and backward

import re
s=input()
pattern="^[189]\d{7}quot;

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

Answer 2

^ is marker for start of string
$ is marker for end of string

in python, 'match' method always search match from string start (marker for start is not required, as it is implicit).
however, 'search' method search from anywhere in the string (so marker for start would be required, if needed).

so, as you're using 'match' method, you could shorter your regular expression as:

pattern="[189]\d{7}quot;

Answer 3

))) Oh, it's so easy and really cool! Thanks )))