title: Codeigniter form validation allow numeric type to include comma
body: <p>When validating prices with CI I use the following rule;</p>
  
  <pre><code>$this-&gt;form_validation-&gt;set_rules('price','lang:price','required|numeric|greater_than[0.99]');
  </code></pre>
  
  <p>Is there any way to allow commas in this rule line? Or do i have to create a callback?</p>