in reply to [perldoc] keyword search
On this Debian box there's perldig (from package libperldoc-search-perl). I just tried a search for "qr" and it found a rather useless 501 hits.
There's an article on perldig: http://www.linux-magazin.de/Artikel/ausgabe/2003/10/perl/perl.html. It's written in German, so I can't comment on its worth:)
In Section
Seekers of Perl Wisdom