How to mark lines with the first 10 characters duplicated

[Jose Emilio Osorio]

@Ekopalypse
1234567890;Example1;100
1234 ;Example2;200
1233334554;Example3;300
1234567890;Example7;700
I need to mark the line 1 and 4.

[Ekopalypse]

@Jose-Emilio-Osorio said in How to mark lines with the first 10 characters duplicated:

I assume that the first 10 characters are always digits and can be any combination?

[Jose Emilio Osorio]

@Ekopalypse
Can be any combination

[Ekopalypse]

@Jose-Emilio-Osorio

Is it important that we keep the lines as it is or can we sort the document first?

[Jose Emilio Osorio]

@Ekopalypse
The document is sorted by the first 10 characters.
I want to mark the lines first to check them, and then delete

[Ekopalypse]

@Jose-Emilio-Osorio

what about this?

find:(.{10}).*\R\1

Checking regular expression.

[Jose Emilio Osorio]

@Ekopalypse said in How to mark lines with the first 10 characters duplicated:

(.{10}).*\R\1

Thank you very much. It works.
Last question: How could I delete the line duplicated ? For example just the line 4

[Ekopalypse]

@Jose-Emilio-Osorio

if it is not important which line gets deleted we could use

find what:(.{10}).*\R(?=\1)
replace with is empty

[Jose Emilio Osorio]

@Ekopalypse said in How to mark lines with the first 10 characters duplicated:

(.{10}).*\R(?=\1)

Thank you very much.

[Jose Emilio Osorio]

@Jose-Emilio-Osorio
If there are more two lines duplicated, can I use this regex ?

[Alan Kilborn]

@Jose-Emilio-Osorio

1234567890;Example1;100

1234 ;Example2;200

1233334554;Example3;300

1234567890;Example7;700

I need to mark the line 1 and 4.

The document is sorted by the first 10 characters.

Hmmm, not seeing the document as being sorted… what am I missing?

[Ekopalypse]

@Jose-Emilio-Osorio said in How to mark lines with the first 10 characters duplicated:

If there are more two lines duplicated, can I use this regex ?

Yes, I guess so.

[Ekopalypse]

@Alan-Kilborn

maybe just a copy/paste before the sorting took place.