m!http://(|www)\.perlmonks\.(org|net|com)/! all work. For that matter, there is also ads.perlmonks.org, as well as at least two more ways of accessing the main site. Also, ns4.perlmonks.(org|net|com) will give you another view of the site.
Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).