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This is a candidate for the reference javascript implementation of the Porter2 stemming algorithm, (rev. July 2005).

There is a second project which covers the original Porter Stemmer from 1980, you can find that at the following url:

The reference has also been included in the spec directory.


Include the js file, then run stemmer(<word to stem>) to return the stemmed word.

You can get a trace as to what is going on, corresponding to the steps outlined in the papers, by provding a second argument of "true" and using one of the browser debug consoles.

For instance, stemmer("hopefully", true) will output 1c /^(.*[aeiouy].*)y$/ hopefulli, telling us that rule 1c was matched by that regular expression and as a result, we got hopefulli.


As of Oct 22, 2012, PorterStemmer2 is 98.54% compliant.