title: Using regular expressions to find img tags without an alt attribute
body: <p>I am going through a large website (1600+ pages) to make it pass Priority 1 W3C WAI.  As a result, things like image tags need to have alt attributes.</p>
  
  <p>What would be the regular expression for finding img tags without alt attributes?  If possible, with a wee explanation so I can use to find other issues.</p>
  
  <p>I am in an office with Visual Web Developer 2008.  The Edit >> Find dialogue can use regular expressions.</p>