How to extract numbers from a string in Python?

Question

I would extract all the numbers contained in a string. Which is the better suited for the purpose, regular expressions or the isdigit() method?

Example:

Answer 1

For phone numbers you can simply exclude all non-digit characters with \D in regex:

import re

phone_number = '(619) 459-3635'
phone_number = re.sub(r"\D", "", phone_number)
print(phone_number)