title: AucTeX/emacs problem with '$' character
body: <p>AucTeX on emacs is pretty amazing tool, but when I write one single '$', all the coloring is broken. </p>
  
  <p>Normally one '$' is accompanied by another '$' to express math equations, but for source listing single '$' is frequently used. </p>
  
  <pre><code>\begin{Verbatim}
  (let ((buffer (url-retrieve-synchronously
  ...
      (re-search-forward "^$" nil 'move) &lt;-- It breaks the coloring 
  ...
  \end{Verbatim}
  </code></pre>
  
  <p>The easy solution is as follows to match the '$'.</p>
  
  <pre><code>(re-search-forward "^$" nil 'move) ;; $
  </code></pre>
  
  <p>Is there any option in AucTeX to prevent this single '$' problem?</p>