The wildcard you want is just "$region."
In post #7 you still have "selected regions" enabled. That is intended to let you select regions in the region manager, as you are doing in post #8. If you want to use the region matrix to completely specify which regions to render, set "bounds" to "project regions."
The idea with project regions vs selected regions is that you can set up a region matrix render, then either render everything you have chosen in the matrix, or use the region manager to select regions so you can render only parts of the matrix if needed.
In post #8 everything will be as you expect if you just fix the wildcard. From the wildcard help:
Quote:
Originally Posted by the wildcard help
$region : region name
$region(name) : value part of region matching name=value
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If you had a region named, for example, "name=value", then $region would resolve to "name=value" and $region(name) would resolve to just "value". If the region was named "foo=bar" then $region(foo) would resolve to "bar".