There are 2 excellent articles in
Linux Journal from thier "At the Forge" columns.
At the Forge: A Simple Search Engine
At the Forge: More About Searching
Reuven's columns are aimed at novice CGI coders, they are almost always in Perl.
He discusses some simple concepts about search engines, but I would have to agree with
Ovid. If you find something that works, don't reinvent the wheel. If Perlfect does not work you these articles should be a good starting place.
grep
grep> cd pub
grep> more beer
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