title: Regex for float with comma
body: <p>I need to validate an input, contains price of an item.
  The value could be..</p>
  
  <pre><code>1.2
  1.02 
  30,000 
  30,000.00 
  30000000
  </code></pre>
  
  <p>So I need the regex to support this.</p>