Does a profiler exist for regular expressions? The only thing I could find was re's debug mode, but the output isn't very intuitive. I am imagining something like Devel::NYTProf with flame graphs indicating which sections of a regex need optimizing. Take the common whitespace trimming example s/^\s+|\s+$//g; it turns out to sub-optimal because the alternation negates the anchor optimization. Since I can't make heads or tails of re's debug mode output, the only tool in my toolbox for diagnosing regexen is to compare runtimes with Benchmark. Since regular expressions are a feature of many other languages, a better solution might even exist outside of perl.

In reply to Regex profiler by phizel

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