How do I implement Search Functionality in a website? [closed]

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Use lucene,
http://lucene.apache.org/java/docs/

Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.

It is available in java and .net. It is also in available in php in the form of a zend framework module.

Lucene does what you wanted(indexing of the searched items), you have to keep track of a lucene index but it is much better than doing a database search in terms of performance. BTW, SO search is powered by lucene. 😀

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