title: regular expression javascript with punct,space and alnum
body: <p>Hello i need a regular expression for an empty string or a string with punct,alnum,and digit.</p>
  
  <p>i try something like this but it doesn't work; what are my errors???</p>
  
  <p>Thx for help</p>
  
  <pre><code>var regularExp=/(^$ || ^[[:alnum:][:punct:][:space:]]{80}$)/i;
  </code></pre>