exclude filter?

[ajfclark]

Just wondering if it'd be worth adding an exclude configuration option? Something like:

feeds:
  - url: http://www.somesite.com/feed.rss
    regexp: cool-package
    exclude: i386

Rather than needing some awkward negation on a regexp like ^(.(?!i386))*$

[quite]

Expanding on this, I would guess what we all want is some way to specify a pattern (or pattern with group) for which no duplicates would be downloaded...