JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<a class="ganna" href="/url?q=http://www.thidiff.com/&amp;sa=U&amp;ved=0ahUKEwiexM7XmaPRAhWmrVQKHUmXDXMQ_BcIYygBMBA&amp;usg=AFQjCNEf9K9tDpISjuX1qkTOHK_aeiPrwQ">Website</a>


<a class="ganna" href="/url?q=http://www.sahasraadvisoryagency.com/&amp;sa=U&amp;ved=0ahUKEwjOxOnmmaPRAhUHh1QKHRR3B4cQ_BcIVCgBMA4&amp;usg=AFQjCNFIbN_BcKr1501xZcqpER22-Bfy4A">Website</a>

JavaScript

$('a.ganna').each(function(){
   var href = $(this).attr('href');
   var ampIndex = href.indexOf('&');
   //console.log(ampIndex);
  var httIndex = href.indexOf('htt');
  //console.log(httIndex);
  
  alert(href.substr(httIndex, ampIndex-httIndex));
});