Lol, yup, I've noticed that since Xathrid Necromancer was first printed. As far as bugs go, this one is pretty charming.
I was going to blame any number of factors, but then I figured I should actually take a look. This is totally embarrassing, but I have an extra 'x' in my regular expression pattern. Whoops. Should be fixed now.
Oh man it's gone :C
Well that's ok, now we can differentiate between oldfags and newfags: people who remember the "x bug" and people who don't. And actually people who were on the original google group will be like "Ha, that doesn't even count. Who here still remembers the google group?"