regular expression format with jquery replace function to replace a string prior to an @ symbol

I'm using html, css and jquery.

I saw the regex example at this link
http://stackoverflow.com/questions/1329329/using-jquery-and-regular-expressions-to-change-part-of-href

So then I created this fiddle: https://jsfiddle.net/3wy1zvdc/

In this fiddle in my hyperlink, I replace the value of the href attribute from google.com to bing.com using regular expression.
This works just fine.


So now I'm creating another example with a hyperlink tag that looks like this:

<a id="Link1" class="Link1Class" href="http://www.google.com@item.LastName" >Davolio</a>

Using regular expression like I did in my fiddle above how would I replace everything before the @ symbol in my href tag with the value aol.com

So then on page load my hyperlink tag would contain this:

<a id="Link1" class="Link1Class" href="http://www.aol.com@item.LastName" >Davolio</a>

Anyone know the regular expression format for this?