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I'm playing around with study , a Perl feature to examine a string to make subsequent regular expressions potentially much speedier: while( <> ) { study; $count++ if /PATTERN/; $count++ if /OTHER/; $count++ if /PATTERN2/; } There's not much said about which situations will benefit from this. A few things you can tease out of the docs : Patterns with constant strings Multiple patterns Shorter target strings might be better (takes less time to study) I'm looking for concrete cases where I not only can demonstrate a big advantage, but also cases that I can slightly tweak to lose that advantage. One of the warnings in the docs is that you should benchmark individual cases. I want to find some of the edge cases where a small difference in a string (or pattern) makes a big difference in performance. If you haven't used study , please don't answer. I'd rather have well-formed correct answers instead fast guesses. There's no urgency here, and this isn't holding up any work. And, as a bonus, I've been playing with a benchmarking tool comparing two NYTProf runs, which I'd rather use than the usual benchmarking tool. If I come up with a way to automate that, I'll share that too.

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