You can use google for that.
If you want for example to search in "Seekers of Perl Wisdom" you can try this:
site:www.perlmonks.org "has asked for the wisdom of the Perl Monks" se
or if you use the firefox needlesearch plugin or similar: you can use this url:
It's _a lot_ faster too. And you can view the results in Goolge's cache too - taking a litte load off perlmonks. :)