You could start with Adding Search Functionality to Perl Applications, Building a Vector Space Search Engine in Perl and Designing a Search Engine. There are also many nodes here, for example:

• Search Engine Theory
• Search Engines for Dummies
• Writing a site search engine
• Search Engine troubles
• Search engine design
• How to Simply Search a Web Site?
• Speed up the search
• Perl Search Applicance
• Search engine
• Using DBIx::FullTextSearch

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