title: Interpret this particular REGEX
body: <p>I did a REGEX pattern some time ago and I don't remember its meaning. For me this is a write-only language :)</p>
  
  <p>Here is the REGEX:</p>
  
  <pre><code>"(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$"
  </code></pre>
  
  <p>I need to know, in plain English, what does it means.</p>