title: jQuery regex validation: unsigned integer or float (max 2 decimal), only dot, not comma
body: <p>I'm in trouble: i need a regex that match this</p>
  
  <p>VALID: </p>
  
  <pre><code>3
  44
  55.5
  66.66
  777
  </code></pre>
  
  <p>NOT VALID: </p>
  
  <pre><code>3,3
  .4
  .55
  -7
  </code></pre>
  
  <p>The regex must validate only unsigned integer or float, only dot (not comma), max 2 decimal.</p>