Remove every website ending with .com except one using regex

Question

I'm currently struggling with regex. I'm trying to substitute every website ending with a ".com" except one, that is "crypto.com" as it's not a website per se but also the name of a cryptocurrency.

Let's take this sentence:

"Here are my favorite things: crypto.com, polo.com, cryp.com and google.com"

Inspired by this answer, this is my Python regex:

r"(\w+\.)?crypto\.com"

The problem, using https://regex101.com to test it out, is that it's capturing only the crpyto.com, but not the others (which is what I want to do).

Can anyone tell me how to proceed? Thank you!

Expected code:

text = "Here are my favorite things: crypto.com, polo.com, cryp.com and google.com"    
text = re.sub(r"(\w+\.)?crypto\.com", '', text )

Expected output:

"Here are my favorite things: crypto.com,, and "

@WiktorStribiżew Using your regex, the only thing that's being replaced is the polo.com — Jauhnax
– Jauhnax, Commented Dec 1, 2021 at 13:05
Why? See regex101.com/r/BWtX6c/2. I tried to make it a bit more comprehensive, see regex101.com/r/BWtX6c/1. You may add rstrip(',') in Python code. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Dec 1, 2021 at 13:12

Wiktor Stribiżew · Accepted Answer · 2021-12-01 13:16:19Z

1

You can use

\s*\b(?!crypto\.)\w+\.com\b

See the regex demo. Details:

\s* - zero or more whitespaces
\b - a word boundary
(?!crypto\.) - a negative lookahead that fails the match if there is crypto. string immediately to the right of the current location
\w+ - one or more word chars
\.com - .com
\b - a word boundary.

See the Python demo:

import re
text = "Here are my favorite things: crypto.com, polo.com, cryp.com and google.com"
print( re.sub(r'\s*\b(?!crypto\.)\w+\.com\b', '', text) )
# => Here are my favorite things: crypto.com,, and

A more comprehensive regex can also be used to remove commas and the word and:

(?:\s*(?:,|and\s*)?)\b(?!crypto\.)\w+\.com,?

See this regex demo.

answered Dec 1, 2021 at 13:16

Wiktor Stribiżew

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2 Comments

Jauhnax Over a year ago

I copy/paste yours and for an unknown reason (maybe there was a typo I didn't spot...) it didn't work. However, your demo works perfectly! Thank you very much for your help!

Wiktor Stribiżew Over a year ago

@Jauhnax How strange, I also copied the code from my comment and pasted into ideone.com. :)

alex · Accepted Answer · 2021-12-01 13:10:11Z

0

Use a negative look-around:

(\w+)?(?<!crypto)\.com

Edit: The question changed slightly I removed a \. that was incorrect, now it should work!

answered Dec 1, 2021 at 13:10

alex

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3 Comments

Wiktor Stribiżew Over a year ago

Your regex will fail to match crypto.com in decrypto.com.

alex Over a year ago

As I understand, OP would not want to match that. Or is decrypto.com another cryptocurrency? In this case, they do want that.

Wiktor Stribiżew Over a year ago

crypto and decrypto are different words. The requirement is to only fail one word, crypto.

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