I have this snippet:
~~~
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval
"%{expand:%{%{gsub %{name} - _}_prerelease}}"
.dev
~~~
But if the `name` does not match to the next definition, the non existing
variable is printed out:
~~~
$ rpm -D "name foo" -D "string_io_prerelease .dev" --eval "%{expand:%{%{gsub
%{name} - _}_prerelease}}"
%{foo_prerelease}
~~~
But I would like to just ignore such output, but this (the additional `?`) does
not work (the output is always empty):
~~~
$ rpm -D "name foo" -D "string_io_prerelease .dev" --eval "%{expand:%{?%{gsub
%{name} - _}_prerelease}}"
$ rpm -D "name string-io" -D "string_io_prerelease .dev" --eval
"%{expand:%{?%{gsub %{name} - _}_prerelease}}"
~~~
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