preg_match_all not working when trying to get all characters including whitespace

Here is my function:

function grabstuff()
 {
     foreach (glob("../folder/*.php") as $fn) 
     {
         $file = file_get_contents($fn);
 
         preg_match_all("#\{\('(\w+)'\)}#", $file, $matches);   
 
         foreach ($matches[1] as $match) 
         {
 
             $query = ("ALTER TABLE xxxxx ADD COLUMN `$match` LONGTEXT AFTER xxxxx;");
 
             $result = mysql_query($query) or die("Err: ".mysql_error());
 
         }
     }
 }
 

And here is what it looks for on the pages:

<?/*{('test test')}*/?>
 

It is ignoring this instance where there is a whitespace. It works well for testtest and test_test. Not getting any php errors or mysql errors. Do I need to use \w+\S or \w+\W? I tried both of those, even (...) and it still didn't work. How do I get my above function to recognize any characters within the {('')}, whether they be a normal abc characters or whitespace. I'm sure this is simple. I've done research on google and here and wasn't able to find a solution. (There will be multiple instances of {('')} on any given page if that helps). I've been using this function for a while now, but would like to add the ability to include whitespaces. Thanks!

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