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<?php $string = 'Samsung UN32EH4003 32-inch 720p 60Hz LED HDTV (Black)'; $arr=array(); preg_match_all('/\b([0-9A-Za-z]{3,})\b/i', $string, $arr); $keywords = array_slice(array_unique($arr[0]),0,3); echo implode(' ', $keywords);
Output for git.master, git.master_jit, rfc.property-hooks
Samsung UN32EH4003 inch

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