Which of the following regular expressions can be used to get the domain name? python

Question

Which of the following regular expressions can be used to get the domain name?

I try the next code but it doesn't work, there is something that i'm doing wrong?

In the picture the another options

txt = 'I refer to https://google.com and i never refer http://www.baidu.com'
print(txt.findall(?<=https:\/\/)([A-Za-z0-9.]*))

You only have one regular expression. What do you mean by "which of the following"? — Barmar, Nov 03 '20 at 02:32
Hi I realized I didn't add the image but now it is ... I have those options to solve the problem, but I was testing with everyone and everyone gave me an error ... you can click to see the image — 28Greka, Nov 03 '20 at 02:38
You selected the correct regexp, you just have to put it in a raw string to use it in Python. — Barmar, Nov 03 '20 at 02:43
Oh okay okay so... i don't need to put the "https" into the square bracket like i did in the code, right? or i have to do it like is in the image? — 28Greka, Nov 03 '20 at 02:48
Why would you put it into square brackets? Square brackets are for things like `[a-zA-Z0-9.]` — Barmar, Nov 03 '20 at 02:51

score 0 · Answer 1 · answered Nov 03 '20 at 02:37

0

Here's a regex that'll get your URLs

http(s?)://(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]

If you don't want the http or https just use this:

(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]

answered Nov 03 '20 at 02:37

Halmon

The question was updated with a multiple-choice quiz. He's not looking for a general solution, just the best one of the choices. – Barmar Nov 03 '20 at 02:41

score 0 · Accepted Answer · answered Nov 03 '20 at 02:46

0

You selected the correct regexp, you just have to quote it to use it in Python. You also need to call re.findall(), it's not a string method.

import re

txt = 'I refer to https://google.com and i never refer http://www.baidu.com'
print(re.findall(r'(?<=https:\/\/)([A-Za-z0-9.]*)', txt))

answered Nov 03 '20 at 02:46

Barmar

2 Answers2