title: regular expression to match 8 alphanumeric starting with number 2 and at least has two number in it
body: <p>Currently I have the following regular expression that matches 8 digits alphanumeric, I want to modify it such that it has to start with the number 2 and contains at least 2 numbers in this 8 digit. How can I do so?</p>
  
  <pre><code>preg_match('/[A-Za-z0-9]{8}/', $bio)
  </code></pre>