How to use python to replace 'http://xyz.example.com' to 'http://example.com' with regular expression

Question

Note: 'xyz' is just a template. it may be '123' or 'abc-123'

There is probably a library to strip the subdomain from the URL, if that's what you're looking for — TankorSmash, May 25 '17 at 15:47
I would not use `re` for this, rather `urllib.parse`, which is made specifically to parse and create URLs — Cory Kramer, May 25 '17 at 15:48
https://stackoverflow.com/questions/14406300/python-urlparse-extract-domain-name-without-subdomain — TankorSmash, May 25 '17 at 15:50
Is regex really a requirement? You dont need them in this case. — Matt Messersmith, May 25 '17 at 15:51

Olian04 · Answer 1 · 2017-05-25T15:55:28.070

3

This would do it:

import re

input = 'http://xyz.example.com'

output = re.sub(r'(?<=http:\/\/).*?\.', '', input)

print(output)

(?<=http:\/\/) is a positive look behind for http://
.*?\. matches everything that isn't a new line token lazily up until the first .

edited May 25 '17 at 15:55

answered May 25 '17 at 15:48

Olian04

1 Answers1