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Interestingly, i think most of your speed on Stemmer come from using String.replace_suffix, which use binary pattern matching instead of regex.

Nice learning :)

I wonder if the new regexp code in Ruby 2.4 would address some of that

Author here. When I was benchmarking my library against a ruby one, I did actually try the ruby one on 2.4. Interesting findings are:

- Switching from =~ to Regex.match? did not yield significant speed improvement

- Without any changes though, 2.4.0-preview1 ran the stemming in 19s, compared to the 25s on 2.3.1.