The link posted in Re^2 by AnonyMonk points to an elderly post which links to the (sorely outdated) docs here on-site.

A better way to do this is [docs://perlre] which produces a link, perlre, (to the perlre page http://perldoc.perl.org/) and the current docs.

Though, I suppose, if directing one's suggestions to someone who hasn't updated/upgraded his or her installed Perl since 1999, the Monastery docs might be more appropriate.