What makes this impressive to me is the author did not know Perl going in. Just looking for danger-functions like `eval` and understanding regex was enough to

What makes this impressive to me is the author did not know Perl going in. Just looking for danger-functions like `eval` and understanding regex was enough to find this. I really like the way the article was written, too. It was easy to follow each step and I never felt like there was a "and draw the rest of the owl" step.