although it is not updated for 2 years but it is working find , very easy to install , helps as a simple search engine too
thanks for the plugin
found a bug + bugfix:
new code in hashtag/hashtag.php function hashtag_regex_replace:
$content = preg_replace('/(?!:).(^|\s)#(\w*[a-zA-Z_]+\w*)/i', '\1#\2', $content);
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