Now, a post by Anonymous Monk carries no author identity, making this process impossible.
But that doesn't mean writings by the Anonymous Monk aren't protected by copyright.
If the post does not include an explicit statement, check the poster's home node to see if they have made a blanket statement on the subject (as I, among others, have done).
Ehm, if I'm concerned about the legality of using code posted here, would I really be satisfied by a remark under the moniker "herveus" about his code? If I get sued by the person writing under the name "herveus", does my claim that at one point in time the "home node" contained a disclaimer to use the code hold up in court? By the time of the court case, the page may have gone. Or perhaps the entire perlmonks site will be gone by then. Of course, the plaintiff himself may have a hard time proving it was him writing under the name of "herveus".