How to keep only unique line in notepad++

Question

i have this data

aaa
aaa
bbb
ddd
bbb
ccc

how to keep only unique lines as this result

ddd
ccc

Thanks much for any help

This will just remove duplicates. User wants to remove all lines that occur more than once. — Penguin, Feb 01 '17 at 17:30

Penguin · Accepted Answer · 2017-02-01T17:40:47.253

5

Try doing a find and replace all in regex mode with:

^(.*?\R)\1+

and replace with nothing.

Apologies, just observed this will not work is list is not sorted.

edited Feb 01 '17 at 17:40

answered Feb 01 '17 at 17:32

Penguin

Just observed it, I don't know how to unmark as best answer. Added a note. – Penguin Feb 01 '17 at 17:42

user3528679 · Answer 2 · 2017-02-06T02:26:30.723

3

Two step

1st : Edit - Line Operations - Sort Lines Lexicographically Ascending
2nd : replace "(?-s)^(.+\R)\1+" with nothing

Anyone can explain the answer ? .Thanks

edited Feb 06 '17 at 02:26

answered Feb 01 '17 at 17:50

user3528679

1

See @olufon answer, it works when the file is ordered. – Toto Feb 01 '17 at 17:52

score 1 · Answer 3 · answered Jul 12 '21 at 17:33

1

For anyone still ending up here, you can now do:

Select text to operate on 
Edit->Line Operations->Sort Lines Lexicographically Ascending
Edit->Line Operations->Remove Consecutive Duplicate Lines

answered Jul 12 '21 at 17:33

StephenL

score 0 · Answer 4 · answered Jan 23 '23 at 05:14

user3528679's answer works, except there's one correction in the second step.

For the regex find and replace, do not replace with nothing/blank, instead replace with the captured string in the capture group (replace with $1)

The regex selects a group of one or more consecutive duplicates. Replacement with $1 will replace the whole group with the captured string.

4 Answers4