RegExp for preg_split()

["Weber Sites LTD" <berber@xxxxxxxxxxxxxxx>]

Hi
 
I'm looking for the RegExp that will split a search string into search
keywords.
while taking " " into account.
 
>From what I managed to find I can get all of the words into an array but I
would 
like all of the words inside " " to be in the same array cell.
 
NE1?
 
thanks
 
berber