filter doesn't filter

[thepiotr]

I set up the following filter:

However the affected feed also displays other files:

It looks like I'm doing nothing wrong, but I can't see what. :/

[ciaobaby]

And we are talking about ... what exactly????

[thepiotr]

For some reason the link to my picasa images is broken. :-(

Not sure how to post images inline. Here's the link to the filter screenshot:

https://picasaweb.google.com/lh/photo/UqdK-0MSSpcuGh-4zc-onMn3tcEbHGsiU-nAYhwc6_A?feat=directlink

And here's the link to the feed screenshot:

https://picasaweb.google.com/lh/photo/fzJbpXuYieRwvrdOrPQF3Mn3tcEbHGsiU-nAYhwc6_A?feat=directlink

Basically, I set up a filter looking for expression The?Walking?Dead?* and applied it to the Extratorrent comics RSS feed. However the feed also shows other files, such as Avengers, i.e. it's apparently not filtered.

By the way, I read somewhere (the tutorial?) that you could apply a filter to several feeds. However as far as I can see, when you create a filter, you can only choose a single feed to apply it to in the drop-down list. :/

Grateful for your help!