Search Function

I want a Searching for file/folder(s) on the site that uses "regular expressions" match strings.

Personally, I'd be delighted with even a simple search function for cached directories, at least to start. Even the ability to search the current view like Internet Explorer uses (ctrl-F) would be great!

Sure, regexp parsing is cool, but if it's a huge project to code it, that would hold up having any kind of search at all...