title: Regex for validation numbers with commas and space
body: <p>I am not sure why this regex expression is not working. 
  I want to validate if the input is in this format : <ol><li>12345678,12345678,12345678</li><li>*space*12345678 , 12345678 , 12345678 , 12345678 </li><li>12345678,12345678, <em>space</em></li></ol>
  It must be 8 digit if not return false. 
  Below is the regex expression that i did, But it is working for 2 sets of numbers but when i input another set of numbers validation is not working. </p>
  
  <ol><li>Working: 12345678 , 12345678 </li>
  <li>Not Working: 12345678 , 12345678 ,12345678</li>
  </ol>
  
  <pre><code>var validate_numbers = /^\s*\d{8}\s*\+*(,\s*\d{8},*)?$/;
  </code></pre>
  
  <p>Thank you</p>