title: Regular Expression for not allowing two consecutive special characters
body: <p>What i am trying to do is to <strong>not</strong> allow <em>two consecutive special characters</em> like <code>&amp;*</code> or <code>*$</code> or <code>&amp;&amp;</code>, but it should allow special characters in between strings like <code>Hello%Mr&amp;</code>.</p>
  
  <p>What i have tried so far:</p>
  
  <pre><code>^(([\%\/\\\&amp;\?\,\'\;\:\!\-])\2?(?!\2))+$
  </code></pre>