ruby on rails - Thinking Sphinx wild card search and fuzzy operator not found -

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i trying implement full text set of models. heard power of sphinx in indexing speed , search time. wild card searches , nearest word match ( levenshtein distance) not working in this.

    post.search 'kar'  returns no results while      post.search 'karthik'  returns 10 results matching exact string. tried star parameter     post.search 'kar' , :star => true  returns 0 results.

i tried combinations 'kar*' , 'krathik~' , etc in lucene flavored full text search engines , works fine. missing optional parameters or sphinx still lacks feature?

have added following config/sphinx.yml file?

development: min_infix_len: 2 sql_host: localhost sql_user: root

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