AGREP (approximate grep) probably does what you want and the algorithms are outlined on the site, plus you can get the source code. A variation built around this code may well be as fast as it gets. Here is a postscript research paper on it

cheers

tachyon

In reply to Re: Fuzzy Searching: Optimizing Algorithm Selection by tachyon
in thread Fuzzy Searching: Optimizing Algorithm Selection by Itatsumaki

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