title: Java RegEx that matches exactly 8 digits
body: <p>I have a simple RegEx that was supposed to look for 8 digits number:</p>
  
  <pre><code>String number = scanner.findInLine("\\d{8}");
  </code></pre>
  
  <p>But it turns out, it also matches 9 and more digits number.
  How to fix this RegEx to match exactly 8 digits?</p>
  
  <p>For example: 12345678 should be matched, while
  1234567, and 123456789 should not.</p>