Detecting google in the referer

I have some code that grabs the referering pages referer url and parses it to detect whether it has the string google in it. However it doesnt seem to detect it. Can some look at my code and give a suggestion on how to make it better.

$referer = $_SERVER['HTTP_REFERER'];
 
  //Did they get here from a search?
  if((preg_match('/www\.google.*/i',$referer) && !preg_match('/^http:\/\/www\.google\.com\//i', $referer))
     || preg_match('/search\.atomz.*/i',$referer)
     || preg_match('/search\.msn.*/i',$referer)
     || preg_match('/search\.yahoo.*/i',$referer)
     || preg_match('/msxml\.excite\.com/i', $referer)
     || preg_match('/search\.lycos\.com/i', $referer)
     || preg_match('/www\.alltheweb\.com/i', $referer)
     || preg_match('/search\.aol\.com/i', $referer)
     || preg_match('/search\.iwon\.com/i', $referer)
     || preg_match('/ask\.com/i', $referer)
     || preg_match('/search\.cometsystems\.com/i', $referer)
     || preg_match('/www\.hotbot\.com/i', $referer)
     || preg_match('/www\.overture\.com/i', $referer)
     || preg_match('/www\.metacrawler\.com/i', $referer)
     || preg_match('/search\.netscape\.com/i', $referer)
     || preg_match('/www\.looksmart\.com/i', $referer)
     || preg_match('/go\.google\.com/i', $referer)
     || preg_match('/dpxml\.webcrawler\.com/i', $referer)
     || preg_match('/search\.earthlink\.net/i', $referer)
     || preg_match('/search\.viewpoint\.com/i', $referer)
     || preg_match('/www\.mamma\.com/i', $referer)
     || preg_match('/home\.bellsouth\.net\/s\/s\.dll/i', $referer)
     || preg_match('/www\.ask\.co\.uk/i', $referer)) {
 
Echo "Search Engine Detected";
 
}
 
Here is the value of the referer varibale.
 
http://www.google.com/search?client=safari&rls=en-us&q=Danbury+CT+chive&ie=UTF-8&oe=UTF-8

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