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Fuzzy searching matches parts of words and scores them based on the number of characters matched, the position of the characters in the word, and a number of other factors. See http://scratch.mit.edu/discuss/youtube/eOusbX6L8CI/ for an example of fuzzy searching in Sublime Text. I used a listing of the source code files in http://github.com/LLK/s2forums for the completions.
