How to remove all newlines from selected region in Emacs?

Question

How to remove all newlines from selected region in Emacs?

Answer 1

1. M-x replace-string
2. C-q C-j
3. RET
4. RET

The trick is to quote the C-j with C-q, but otherwise replacing newlines is like replacing anything else.

Answer 2

With my key bindings, which I think are standard, on windows:

Select region

shift-alt-%

ctrl-Q ctrl-J

return

return

!

Or to put it another way, query replace region, ctrl-q to get extended characters, ctrl-j to put in a newline, replace with nothing, all of them.