On a closer look at your code I think nested loops are indeed supported however I am having trouble with installing Filter::Simple so I cannot check.

Oh sure, that kind of thing works. Somehow I thought you meant something more complicated.

Regarding comments and ` operator: to my understanding anything that is not a Brainf*ck operator (that is not in the []-+,.<> set) is automatically treated as a comment and is silently ignored (this lets you have Brainf*ck code span a couple lines rather than being on one long line).

That's true. What led me down this path was the difficulty of adding perl comments after I had commandeered the # character for my debug instruction. But now I see it is easy to work around so I'm not going to bother.

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