Re^2: Perl not BNF-able??

[merlyn]

Actually, I probably misused the word, because I had no idea what it meant until I just looked it up, other than "the thing most people refer to that most clearly defines something".

So, seminal may not apply, but it's still the most clear collection of examples of how Perl parsing is not possible without executing some code, which would have answered your other question had you read it, and if you still haven't, I recommend reading it now.