Hi!


> Searching through all of those, by opening each one in Emacs in sequence,
> with re-search-forward, is surely slower that using Grep.
>

I just tried your `tags-find-regexp' on Windows, and it failed miserably.
It appears to be hanging, but after setting `debug-on-quit' to t and
pressing C-g, it always breaks when running an external "grep" command. My
conclusion is that starting "grep" on windows is very, very slow compared
to opening a temporary buffer and doing re-search-forward.

    -- Anders