Replacing GNU grep revisited
Christopher Weimann
csw at k12hq.com
Thu Jun 26 09:17:43 PDT 2003
On Wed 06/25/2003-11:43:50PM -0700, David Schultz wrote:
>
> The only good string matching algorithm I actually understand is
> KMP, but really smart people tell me Boyer-Moore is the fastest in
> the average case. It *can* be worse than KMP, depending on the
> input, but for nearly all inputs it supposedly works quite well.
> There shouldn't be any patent issues associated with it.
Aho-Corasick and Commentz-Walter specifically deal with searching
for multiple keywords which is really a different problem than
searching for a single keyword like KMP or Boyer-Moore.
Here is a neat applet that shows how AC works.
http://www-sr.informatik.uni-tuebingen.de/~buehler/AC/AC.html
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