Multiple-line collapse in Notepad++

Question

I want to use notepad++ to do multiple-line collapse. What I mean is that I am looking for a simple operation to turn

1
2
3
4

into

1 2
3 4

Answer 1

How about:

• Ctrl+H
• Find what: (.+)\R(.+)(\R)
• replace with: $1 $2$3
• Replace all

Where \R stands for any kind of linebreak.

This will replace a linebreak between 2 lines by these 2 lines separated by a space.