Reversing all characters on each line of a range

Question

In order to invert all characters on each line of a range I could think of the following

:s/.*/\=list2str(reverse(str2list(getline('.'))))"

where I can put a [range] if I want.

Is there any better way to do this? I mean, quicker to write/more performant/more versatile.

Answer 1

If you're on Linux, you probably have rev installed.

Then you can do:

:2,5!rev  

Where 2,5 is range.

Answer 2

A slight improvement

:[range]s/.*/\=join(reverse(split(submatch(0), '\zs')), '')/

The use of submatch allows this to to be more flexible, e.g.,

:[range]s/hello: \zs.*/\=join(reverse(split(submatch(0), '\zs')), '')/

We use split/join because the str2list approach will fail with combining characters, for example;

echo list2str(reverse(str2list('áb')))

prints

b́a