First, let me be clear -- I am absolutely no fan of version tags. I think they're so dangerous that I am on the verge of banning them from the network on all SE 2.0 sites:
https://drupal.meta.stackexchange.com/questions/229/version-tags-considered-harmful
https://sharepoint.meta.stackexchange.com/questions/142/version-tags-considered-harmful
However, I do support version tags existing in the rare event that a question asker can make a legitimate case that their question is in fact specific to a version.
What I object to is the institutionalization of such tags, and the bogus 'requirement' that all new questions have a version tag. This is toxic. But the tags can exist.
So. Do you really want us to blacklist …
^wordpress-\d+.*$
as a tag?
This is basically wishing all the version tags into a cornfield. Once instituted, this blacklist means nobody can ever use wordpress-1.2.3 or anything like it as a tag … ever!
Are you OK with this?