This

intitle:"$$self" site:www.perlmonks.org

kind of works.

From what I can see

• it's better to use site: as last argument
• double dollars "$$" seem to be a problem for the indexer
• google only provides one hit per thread, (mostly but not always the root)
• you'll quickly run into captchas

If that's not good enough, log in and use supersearch