Creating hashtags only, nothing else

I am using this preg_replace to create hashtags twitter style:

$text = preg_replace('/(^|\s)#(\w*[A-Za-z-_]+\w*)/', '<a href="?query&search=$2">#$2</a>', $text);

Code (markup):

The problem is it creates hashtags from everything else that has a # sign. So when someone enters an address. i.e.: Some St. Suit #b75 that b75 will become a hashtag.

Sounds like an impossible task to tell it to differentiate between a real hashtag and something that is not.

What's even worse, if it finds...

Creating hashtags only, nothing else

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