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

Question

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

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
– TankorSmash, Commented May 25, 2017 at 15:47
I would not use re for this, rather urllib.parse, which is made specifically to parse and create URLs — Cory Kramer
– Cory Kramer, Commented May 25, 2017 at 15:48
Is regex really a requirement? You dont need them in this case. — Matt Messersmith
– Matt Messersmith, Commented May 25, 2017 at 15:51

Olian04 · Accepted Answer · 2017-05-25 15:55:28Z

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 .

answered May 25, 2017 at 15:48

Olian04

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