title: what is the jquery opposite of this :not() command
body: <p>I am trying to get all option values that have no attribute value.  So I want it to retrieve options setup like <code>&lt;option value&gt;&lt;/option&gt;</code> entries.</p>
  
  <p>I have <code>$('#advancedSearchWrap option:not([value=""])')</code> but what I need is the opposite.  What is the opposite of this :not() command?</p>