title: Replace the last comma in a string using Regular Expression
body: <p>I have a string like:<br>
      <code>"item 1, item 2, item 3"</code>.<br>
  What I need is to transform it to:<br>
      <code>"item 1, item 2 and item 3"</code>.  </p>
  
  <p>In fact, replace the last comma with " and". Can anyone help me with this?</p>