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Subject: Re: How to select articles by (author|subject|...)
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Lars Clausen <lrclause@cs.uiuc.edu> writes:

> When going into large newsgroups or mail folders, I frequently need to
> just find articles that are from a certain person or with a certain
> subject.  I can't see any easy way to do this in Gnus.  I would expect
> gnus-group-select-by-author or similar.  I have been perusing the info
> pages and FAQs to no avail.  Is there a way to do this?
>
> If not, how hard would it be to make Gnus do the following:
>
> Allow entering a group showing only articles matching a certain
> regexp.

You could do it by entering the group with:

    `C-u M-RET' (gnus-group-quick-select-group, to make it a bit faster)

and then limit by, say, author with `\ a'.  

There is an NNTP extension command, "XPAT", which would allow the
filtering to be done server side -- but Gnus doesn't have support for
it. 

> Interface with a mail database of some kind (haven't started using
> any, as I can't use it from Gnus yet).

Look for `nnir.el' (by Kai Großjohann) which supports various indexing
engines: swish, namazu etc.