i want to keep only unique lines

sophey hence

Hi
Please i have an issue ,
i want to keep only unique lines on notepad++ , i have read some previous posts , but it’s not what i’m looking for ,
example :
aaa
bbb
ccc
ddd
aaa
bbb

i want it to become like this :
ccc
ddd

I want both duplicates to be removed and keep only Unique Lines

thanks

guy038

Hi sophey hence and All,

Indeed, sophey hence, you’re raising a general problem ! How, from the contents of the current file, to keep, ONLY :

A) All the lines which are unique
B) All the duplicate lines
C) The first duplicate line, from all the duplicate lines

UPDATE, on 11/19/16 :

D) All the lines which are unique AND the last duplicate line, from all the duplicate lines

For this last case D), refer to that other post, below :

https://notepad-plus-plus.org/community/topic/12569/delete-duplicate-lines/7

In order to get the lines of these remaining 3 cases A), B) OR C),TWO methods are possible :

METHOD 1 needs, only, a lexical sort and an appropriate regex
METHOD 2 needs some secondary S/R, the use of the Column Editor, two lexical sorts and a main appropriate regex

Of course, METHOD 1 is more simple. However, contrary to the Method 2, it does NOT keep the original order of the lines

Hypotheses :

I supposed that no blank line and empty line exists, in your file. If NOT, just use the regex : SEARCH = ^\h*\R , REPLACE = EMPTY , to get rid of all these useless lines
For METHOD 2, I needs ONE temporary character, NOT presently used, in your file. I choosed the exclamation mark ( ! ). Of course, any other symbol could suit ! However, take care to escape this symbol if it’s a meta character, with special meaning, inside a regex !
Before performing any replacement, remember to go back to the very beginning of your file ( CTRL + Origin )
Use the Replace All button, only, to keeps the present cursor location
I’ll use the sample text, below, containing 15 lines, whose 3 are multiple :

hhhhhhhhhhh
fffffffffffffff
bbbbbbb
bbbbbbb
jj
eeeeeeeeeeeeeeeeeeeeeeeeeee
aaaaa
ccccccccccccccccccccccccccccccccccccccccccccccc
aaaaa
ddd
iiiiiiiiiiiiiiiii
aaaaa
hhhhhhhhhhh
gggggggggggggggggggggggggggggggggggg
bbbbbbb

Well, let’s go !

METHOD 1

Click on the menu option Edit - Line Operations - Sort Lines Lexicographically Ascending

aaaaa
aaaaa
aaaaa
bbbbbbb
bbbbbbb
bbbbbbb
ccccccccccccccccccccccccccccccccccccccccccccccc
ddd
eeeeeeeeeeeeeeeeeeeeeeeeeee
fffffffffffffff
gggggggggggggggggggggggggggggggggggg
hhhhhhhhhhh
hhhhhhhhhhh
iiiiiiiiiiiiiiiii
jj
For case A), use the regexes : SEARCH = (?-s)^(.+\R)\1+ , REPLACE = EMPTY. We get the final text :

ccccccccccccccccccccccccccccccccccccccccccccccc
ddd
eeeeeeeeeeeeeeeeeeeeeeeeeee
fffffffffffffff
gggggggggggggggggggggggggggggggggggg
iiiiiiiiiiiiiiiii
jj
For case B), use the regexes : SEARCH = (?-s)^(.+\R)(?:(\1)+|(?!\1)) , REPLACE = (?2$0). We get the final text :

aaaaa
aaaaa
aaaaa
bbbbbbb
bbbbbbb
bbbbbbb
hhhhhhhhhhh
hhhhhhhhhhh
For case C), use the regexes : SEARCH = (?-s)^(.+\R)(?:(\1)+|(?!\1)) , REPLACE = (?2\1). We get the final text :

aaaaa
bbbbbbb
hhhhhhhhhhh

METHOD 2

Use the regexes : SEARCH = ^ , REPLACE = !!

!!hhhhhhhhhhh
!!fffffffffffffff
!!bbbbbbb
!!bbbbbbb
!!jj
!!eeeeeeeeeeeeeeeeeeeeeeeeeee
!!aaaaa
!!ccccccccccccccccccccccccccccccccccccccccccccccc
!!aaaaa
!!ddd
!!iiiiiiiiiiiiiiiii
!!aaaaa
!!hhhhhhhhhhh
!!gggggggggggggggggggggggggggggggggggg
!!bbbbbbb
Place the cursor between the two exclamation marks !
Open the Column Editor ( ALT + C )
Select the second option Number to insert
Type 1 in the Initial number : and Increase by : zones
Check the Leading zeros option
Click on the OK button

!01!hhhhhhhhhhh
!02!fffffffffffffff
!03!bbbbbbb
!04!bbbbbbb
!05!jj
!06!eeeeeeeeeeeeeeeeeeeeeeeeeee
!07!aaaaa
!08!ccccccccccccccccccccccccccccccccccccccccccccccc
!09!aaaaa
!10!ddd
!11!iiiiiiiiiiiiiiiii
!12!aaaaa
!13!hhhhhhhhhhh
!14!gggggggggggggggggggggggggggggggggggg
!15!bbbbbbb
Use the regexes : SEARCH = ^(.+!)(.+) , REPLACE = \2\1

hhhhhhhhhhh!01!
fffffffffffffff!02!
bbbbbbb!03!
bbbbbbb!04!
jj!05!
eeeeeeeeeeeeeeeeeeeeeeeeeee!06!
aaaaa!07!
ccccccccccccccccccccccccccccccccccccccccccccccc!08!
aaaaa!09!
ddd!10!
iiiiiiiiiiiiiiiii!11!
aaaaa!12!
hhhhhhhhhhh!13!
gggggggggggggggggggggggggggggggggggg!14!
bbbbbbb!15!
Click on the menu option Edit - Line Operations - Sort Lines Lexicographically Ascending

aaaaa!07!
aaaaa!09!
aaaaa!12!
bbbbbbb!03!
bbbbbbb!04!
bbbbbbb!15!
ccccccccccccccccccccccccccccccccccccccccccccccc!08!
ddd!10!
eeeeeeeeeeeeeeeeeeeeeeeeeee!06!
fffffffffffffff!02!
gggggggggggggggggggggggggggggggggggg!14!
hhhhhhhhhhh!01!
hhhhhhhhhhh!13!
iiiiiiiiiiiiiiiii!11!
jj!05!

For case A), use the regexes : SEARCH = (?-s)^(.+!).+\R(?:\1.+\R)+ REPLACE = EMPTY

ccccccccccccccccccccccccccccccccccccccccccccccc!08!
ddd!10!
eeeeeeeeeeeeeeeeeeeeeeeeeee!06!
fffffffffffffff!02!
gggggggggggggggggggggggggggggggggggg!14!
iiiiiiiiiiiiiiiii!11!
jj!05!
Use the regexes : SEARCH = ^(.+?)(!.+) , REPLACE = \2\1

!08!ccccccccccccccccccccccccccccccccccccccccccccccc
!10!ddd
!06!eeeeeeeeeeeeeeeeeeeeeeeeeee
!02!fffffffffffffff
!14!gggggggggggggggggggggggggggggggggggg
!11!iiiiiiiiiiiiiiiii
!05!jj
Click on the menu option Edit - Line Operations - Sort Lines Lexicographically Ascending

!02!fffffffffffffff
!05!jj
!06!eeeeeeeeeeeeeeeeeeeeeeeeeee
!08!ccccccccccccccccccccccccccccccccccccccccccccccc
!10!ddd
!11!iiiiiiiiiiiiiiiii
!14!gggggggggggggggggggggggggggggggggggg
Finally, use the regexes : SEARCH = ^.+! REPLACE = EMPTY. We get the final text :

fffffffffffffff
jj
eeeeeeeeeeeeeeeeeeeeeeeeeee
ccccccccccccccccccccccccccccccccccccccccccccccc
ddd
iiiiiiiiiiiiiiiii
gggggggggggggggggggggggggggggggggggg

For case B), use the regexes : (?-s)^(.+!).+\R(?:(\1.+\R)+|(?!\1.+\R)) , REPLACE = (?2$0)

aaaaa!07!
aaaaa!09!
aaaaa!12!
bbbbbbb!03!
bbbbbbb!04!
bbbbbbb!15!
hhhhhhhhhhh!01!
hhhhhhhhhhh!13!
Use the regexes : SEARCH = ^(.+?)(!.+) , REPLACE = \2\1

!07!aaaaa
!09!aaaaa
!12!aaaaa
!03!bbbbbbb
!04!bbbbbbb
!15!bbbbbbb
!01!hhhhhhhhhhh
!13!hhhhhhhhhhh
Click on the menu option Edit - Line Operations - Sort Lines Lexicographically Ascending

!01!hhhhhhhhhhh
!03!bbbbbbb
!04!bbbbbbb
!07!aaaaa
!09!aaaaa
!12!aaaaa
!13!hhhhhhhhhhh
!15!bbbbbbb
Finally, use the regexes : SEARCH = ^.+! REPLACE = EMPTY. We get the final text :

hhhhhhhhhhh
bbbbbbb
bbbbbbb
aaaaa
aaaaa
aaaaa
hhhhhhhhhhh
bbbbbbb

For case C), use the regexes : (?-s)^((.+!).+\R)(?:(\2.+\R)+|(?!\2.+\R)) , REPLACE = (?3\1)

aaaaa!07!
bbbbbbb!03!
hhhhhhhhhhh!01!
Use the regexes : SEARCH = ^(.+?)(!.+) , REPLACE = \2\1

!07!aaaaa
!03!bbbbbbb
!01!hhhhhhhhhhh
Click on the menu option Edit - Line Operations - Sort Lines Lexicographically Ascending

!01!hhhhhhhhhhh
!03!bbbbbbb
!07!aaaaa
Finally, use the regexes : SEARCH = ^.+! REPLACE = EMPTY. We get the final text :

hhhhhhhhhhh
bbbbbbb
aaaaa

To end with, I also tried a normal case, with a file, containing 1557 lines, whose 189 lines are unique No problem !

Best Regards,

guy038

Pffff! About a complete day to get this post :-)) Really time to eat and rest a bit !

Hà Nguyễn

Hi Guy038 ,

" the regexes : SEARCH = (?-s)^(.+\R)\1+ , REPLACE = EMPTY "

i do that step ,but nothing happen ,why so ,dear