How to delete duplicate lines ?

[bolapedia gg]

i am wondering how to delete duplicate lines in notepad++

for example
1
1
2
3
3
4
4
4

result
2

[Alan Kilborn]

@bolapedia-gg

find: ^(\d+)(\R\1)+\R
replace: nothing
search mode: regular expression

[bolapedia gg]

@alan-kilborn
its not worked, if i have many lines, 5 millions data
i would like to delete duplicate data

a
a
b
c
c
c
d
d
d
d
e
f
f
g
h
h
h

result expected
b
e
g

[Alan Kilborn]

@bolapedia-gg said in How to delete duplicate lines ?:

its not worked

Did you try it on the data you originally supplied?

[Neil Schipper]

@bolapedia-gg
This regex does the transformation: (^.*?\R)\1+

But first go to the end of the file and make sure there is one blank line at the end. (If this isn’t satisfactory I’m pretty sure there’s a way to fix that).

[Alan Kilborn]

@neil-schipper said in How to delete duplicate lines ?:

I’m pretty sure there’s a way to fix that).

(?-s)^(.+)(?:\R\1)+(\R|\z)

Use * instead of + if it is desired to remove duplicate contiguous empty lines.

[bolapedia gg]

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