JSFiddle - React, Tailwind, and code Playground

HTML

<div class='myelement'>
    <a href="/myurl?code1=abcde&code2=fghijk&code3=lmnop&code4=qrstu&code5=vwxyz">Test</a>
</div>
<br>
<label id="test"></label>

JavaScript

var codevar = '#';
$('#test').text($('.myelement a').attr('href'));

$('.myelement').on('click', function(e) {
  e.preventDefault();
    
  var url = $('.myelement a').attr('href');
  var param = '&'+url.substring(url.indexOf('?')+1);
  url = url.substring(0,url.indexOf('?')+1);
  if(param.indexOf(codevar) > -1) {
      var arr = param.split("#/results/");
      param = '';
      for(var i = 1;i<arr.length;i++){
          if(codevar == arr[i].substring(2))
              arr.splice(i, 1);
          param += 'code'+i+'='+arr[i].substring(2);
          if(i != arr.length-1)
              param +='&';
      }
      
      $('.myelement a').attr('href',url+param);
      $('#test').text($('.myelement a').attr('href'));
  }

});