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I've been working on a simple search engine (for no particular reason), and I've run into a problem.

 

I'd like to be able to search for multiple words, and have it return any results in which a certain field contains all or any of those words in any order. So, if I search for "example one" it would return things that contained "one example" and "one other example as well as the exact phrase, or ones that only contain some of the words in the query ("example two").

 

Ideally, it should also give each result a rank based on how closely they match the query, and list them in order of relevance.

 

Anyone have any idea how this could be done?

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