Regex negative lookbehind not valid in JavaScript [duplicate]

Answer 1

Here is a way to parse HTML string using DOM in JS and perform replacements only outside of tags:

var s = '55 2 >= 1 2 > 1';
var doc = document.createDocumentFragment();
var wrapper = document.createElement('myelt');
wrapper.innerHTML = s;
doc.appendChild( wrapper );

function textNodesUnder(el){
  var n, walk=document.createTreeWalker(el,NodeFilter.SHOW_TEXT,null,false);
  while(n=walk.nextNode())
  {
       if (n.parentNode.nodeName.toLowerCase() === 'myelt')
      		n.nodeValue =  n.nodeValue.replace(/>=?/g, "EQUAL"); 
  }
  return el.firstChild.innerHTML;
} 
var res = textNodesUnder(doc);
console.log(res);
alert(res);