[Rpm-maint] [rpm-software-management/rpm] `%{sub:...}` macro does not work with `%{expand:...}` (Issue #3412)

[Vít Ondruch]

> rpm -D "name string-io" -D "string_io_prerelease .dev" --eval '%{sub %{expand:%%?%{gsub %{name} - _}_prerelease} 2 -1}'

Thx for the tip. I was getting to the point of trying multiple `%`. You have saved me some time 👍

There is also different variant it seems:

~~~
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval '%{sub %{expand:%?%{gsub %{name} - _}_prerelease} 2 -1}'
dev
~~~

which kind of makes sense.

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