使用Notepad ++从文件中删除每第二行

Question

I am looking for some regex help.

I have a textfile, nothing super important but I would like to delete every second line from it - I have tried following this guide: Delete every other line in notepad++

However I just can't get it to work, is the regex I am using ok? I am noob with regex

Find:

([^\n]*\n)[^\n]*\n

Replace with:

$1

No matter what I try (mouse position at the beginning, ctrl+a and Replace All) I just can't get it to work. I appreciate any help.

I've put the regex into here: http://regexpal.com/ and if I remove the final \\n it highlights the individual rows.

Answer 1

Make sure you select regular expression for the search mode ...

Also, you may want to make that final newline optional . In the case that there are an even number of lines and you do not have a trailing newline, it won't remove the last line.

([^\n]*\n)[^\n]*\n?

---

Update:

See how Windows handle new lines with \\r\\n instead of just \\n . Try updating the expression to take this into account:

([^\r\n]*[\r\n]+)[^\r\n]*[\r\n]*

---

Final Update:

Thanks to @zx81, I now know that N++ uses PCRE so \\R can be used for unicode newline characters. However [^\\R] won't work (this looks for anything except R literally), so you will need to keep [^\\r\\n] . This can be simplified as :

([^\r\n]*\R)[^\r\n]*\R?