title: RewriteEngine and category link
body: <p>i'm trying to do something like</p>
  
  <pre><code>business/index.html
  business/
  business
  </code></pre>
  
  <p>to open <code>categories.php?prefix=$1</code></p>
  
  <p>i'm used</p>
  
  <pre><code>RewriteRule ^([A-Za-z0-9-]+)/?(index.html)?$ categories.php?prefix=$1 [QSA,L]
  </code></pre>
  
  <p>its worked great, but when open /admin its a real folder, its read it as a category
  how i can exclude that</p>