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:)
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