That's being interpreted as:
linuxor ends with
I don't think this was the original aim here.
Why is this a problem? Well I've just tried to tag something as
linux-headers (a real package in Ubuntu) and a pretty important one if you're compiling stuff against the kernel. Of course there are flowery alternative I could pick (or create), but I just don't see why this is blocked.
TL;DR: I think we need the regex updating to: