JSFiddle - React, Tailwind, and code Playground

JavaScript

var pRegEx = /<p([^>]*)>(.*?)<\/p>/g, m;
var str ="<p>one</p><p id='2'>two</p>"
	 while( (m = pRegEx.exec(str)) != null){
		 var replEndStr = m[2] + "</p>";
		 str = str.replace(  "<p"+m[1]+">" + replEndStr, "<p isElm='true' "+m[1] +">" + replEndStr);
         alert(str)
	 }