I run several large networks and absolutely LOVE the new regex support for anti-splog.
But adding a new rule still requires several hurdles that could be alleviated. Here's a short list of feature requests specific to this functionality.
1) PLEASE add export and import capabilities so I can easily duplicate my new rules to my other sites.
2) I assume this would be possible (manually) if the ability to export/import were added - but in any case, I'd love the ability to use my own blacklist sources to help tune the regex for import. Effectively creating my own bulk filters.
3) Currently you have to individually select "site domain", "site title", "username" OR "email" in the "check" field. Please either add an option to check "all" of these, or make them checkboxes instead so I can selectively apply my new pattern to more than one value (username + email + title).
4) Cosmetic: please move the "add pattern" box to the top of the page. It'll make things easier once there's more than a dozen or so patterns.