Remove all empty lines

Question

I thought that wasn\'t that hard to do, but I want to remove all empty lines (or lines just containing blanks and tabs in Java) with String.replaceAll.

My regex look

Answer 1

If want to remove the lines from Microsoft Office, Windows or an text editor which supports regular expression rendering:

 1. Press Ctrl + F.
 2. Check the regular expression checkbox
 3. Enter Expression ^\s*\n into the find box as it is.

You will see all you black spaces into your editor disappears...