title: RegEx to only match numbers at the beginning of the string?
body: <p>I have the following string:</p>
  
  <pre><code>3d33sds
  32d33sds
  312d33sds
  </code></pre>
  
  <p>How can I extract the numbers at the beginning of the string? The string always starts with numbers but can contain some letters and numbers after first numbers.</p>