How to redirect ex command output into current buffer or file?

Question

How can I redirect or pipe the output of an ex command into my current buffer or a file?

For example, I want to read the contents of all the registers into the curre

Answer 1

Unfortunately I have no rep, so I cannot add this as a comment to 'Francis Niu'.

The execute() function looks like the easiest way to accomplish this, and it was added in vim 8 .

Listed in the new/extended features on vim's github. version8.txt