title: regular expression match digit and characters
body: <p>How can I create a regex expression that will match only characters and numbers?</p>
  
  <p>this regex matched width digit:
  <code>/\D/g</code></p>
  
  <p>how can add characters like <code>-</code> , <code>_</code> , <code>*</code> and etc to it?</p>