How to remove all lines that occur more than once

Question

Im using notepad++ and i have a have large text file with lots of lines that all contain a string with no spaces, I need a way to remove all lines that occur more than once.

For example:

    name1
    name1
    name2
    name3
    name4
    name4
    name5

Would be changed to

    name2
    name3
    name5

Possible duplicate http://stackoverflow.com/questions/3958350/removing-duplicate-rows-in-notepad — Rafa Romero, Sep 12 '14 at 10:10

score 1 · Accepted Answer · answered Sep 15 '14 at 09:53

Search for ^(.*?\R)\1+ and replace with nothing.

From start of line ^, find all characters .*? until the linebreak \R. Then repeat \1 the search from () one or more times +.

Use regular expression search mode.

Lines must be sorted before doing this.

Last line must end with linebreak, or it will not be matched.

How to remove all lines that occur more than once

1 Answers1