title: Must contain at least 2 letters
body: <p>How do I check a string for containing <strong>at least 2 letters in any position/order</strong>? Case-insensitive</p>
  
  <p>This of course only works for one or more letters</p>
  
  <pre><code>if (!preg_match('/[a-z]+/i', $pass)) {
  
  }
  </code></pre>
  
  <p>Then I tried something like</p>
  
  <pre><code>if (!preg_match('/[a-z]{2,}/i', $pass)) {
  
  }
  </code></pre>
  
  <p>But that doesn't work</p>
  
  <p>Thanks</p>
  
  <p>EDIT: by "any position/order" I mean 12345ab / a12345b / 12a345b6</p>