title: HTML5 pattern - dont allow the following characters
body: <p>I want to block the following characters:</p>
  
  <pre><code>( 
  ) 
  / 
  &gt; 
  &lt; 
  ] 
  [ 
  \ 
  " 
  , 
  ; 
  | 
  </code></pre>
  
  <p>What is wrong with my pattern?</p>
  
  <pre><code>pattern="[^()/&lt;&gt;[]\,'|\x22]+"
  </code></pre>