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<?php $str = '#helloworld #test #video #youtube Bon Iver are the best daily surprise :D'; preg_match_all('/#([^\s]+)/', $str, $matches); $hashtags = implode(',', $matches[1]); var_dump($hashtags);
Output for git.master, git.master_jit, rfc.property-hooks
string(29) "helloworld,test,video,youtube"

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