Removing empty lines in Notepad++

Question

How can I replace empty lines in Notepad++? I tried a find and replace with the empty lines in the find, and nothing in the replace, but it did not work; it probably needs r

Answer 1

Sometimes \n\r etc not work, here to figure it out, what your actually regular expression should be.

Advantage of this trick: If you want to replace in multiple file at once, you must need this method. Above will not work...