title: Removing first appearance of word from a string?
body: <p>I'm not familiar with regex, and it would be great if someone giving a solution using regex could explain their syntax so I can apply it to future situations.</p>
  
  <p>I have a string (ie. <code>'Description: Mary had a little lamb'</code>), and I would like to remove <code>'Description: '</code> such that the string would read <code>'Mary had a little lamb,'</code> but only the first instance, such that if the string was <code>'Description: Description'</code>, the new string would be <code>'Description.'</code></p>
  
  <p>Any ideas? Thanks!</p>