Using RegEx in Notepad++ to delete all lines contain certain keywords?

[NZ Select]

I have a list of urls in a text file.

Each URL is one a new line

Example:

https://domain.com/dog.html
https://domain.com/dog-2.html
https://domain.com/cat.html
https://domain.com/cat-2.html
https://domain.com/fish.html
https://domain.com/dolphin.html

I wish to know if there is a way to use RegEx to remove all lines that contain the word cat and fish?

So the list becomes below, which removed 3 lines matched

https://domain.com/dog.html
https://domain.com/dog-2.html
https://domain.com/fish.html

[Terry R]

@NZ-Select said in Using RegEx in Notepad++ to delete all lines contain certain keywords?:

to remove all lines that contain the word cat and fish?

I believe the following (given your example) should suffice.
Using the Replace function
Find What:(?-s)^(.+)?(cat|fish)(.+)?\R?
Replace With: leave this field empty
This is a regex so search mode must be “regular expression” and have wrap around ticked.
I should mention this ONLY looks for those characters, so if the word cat or fish is part of a larger word it will still be removed. So cater or fisherman also get removed.

Terry

[Terry R]

@Terry-R said in Using RegEx in Notepad++ to delete all lines contain certain keywords?:

if the word cat or fish is part of a larger word it will still be removed

A slightly revised regex would be
Find What:^(.+)?(\bcat\b|\bfish\b)(.+)?\R?

This expects non word characters (boundaries) to exist around the words cat and fish, thus cat-2 is still caught.

Terry