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Agrep (Approximate grep) is a fuzzy string searching program, developed by Udi Manber and Sun Wu between 1988 and 1991, for use with the Unix operating system. It was later ported to OS/2, DOS, and Windows.
It selects the best-suited algorithm for the current query from a bunch of the known fastest (built-in) string searching algorithms.
Agrep is also the search engine in the indexer program GLIMPSE. It is free for private and non-commercial use only, and belongs to the University of Arizona.
There is also another implementation of agrep as a part of the TRE regexp matching package. It is
licensed under the GPL.
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