We’ve had a few inquiries regarding boolean (”AND”/”OR”) searches. We do allow this, we simply approach it in a fashion that’s easier to view and modify.

You’ll notice a checkbox that reads “filter only if all criteria are met” at the bottom of each of your filters. Checking this creates a logical “AND” between each “contain” rule and a logical “OR” between each “does not contain” rule.

So, if you’d like to block all posts that do not contain Web 2.0 OR Paris Hilton AND block posts that contain crufty, you’d set up the following rules:

(and then check “filter only if all criteria are met”)

This will make sure that you get your posts about Web 2.0 or Paris but not if they contain crufty.

Hope that makes sense. We’re implementing a built-in regular expression option for all you information scientists out there as well. Should be ready shortly.