JSFiddle - React, Tailwind, and code Playground

HTML

<div class="questionV1">
  div1
</div>

<div class="questionV2">
  div2
</div>

<div class="questionV3">
  div3
</div>

JavaScript

function initShowHideDivs(){
  var divs = document.getElementsByTagName('DIV');
  
  var divCounter = 1;

  for(var index in divs){
    var div = divs[index];
    if(div.className === 'questionV1'
      || div.className === 'questionV2'
      || div.className === 'questionV3') {
        
      console.log("|| matched " + div.className);
    }
  }

  for(var index in divs){
    var div = divs[index];
    if(/questionV[123]/.test(div.className)) {
        
      console.log("regex matched " + div.className);
    }
  }
}

initShowHideDivs();