How do I extract words starting with a hash tag (#) from a string into an array

Question

I have a string that has hash tags in it and I'm trying to pull the tags out I think i'm pretty close but getting a multi-dimensional array with the same results

  $string = "this is #a string with #some sweet #hash tags";

     preg_match_all('/(?!\b)(#\w+\b)/',$string,$matches);

     print_r($matches);

which yields

 Array ( 
    [0] => Array ( 
        [0] => "#a" 
        [1] => "#some"
        [2] => "#hash" 
    ) 
    [1] => Array ( 
        [0] => "#a"
        [1] => "#some"
        [2] => "#hash"
    )
)

I just want one array with each word beginning with a hash tag.

Answer 1

this can be done by the /(?<!\w)#\w+/ regx it will work