JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/xregexp/2.0.0/xregexp-all-min.js"></script>

JavaScript

var str = "😁wew😁";//\u1F601
debugger;
var reg = XRegExp("[\u1F601-\u1F64F]", 'g'); //  /[ὠ1-ὤF]/g -doesn't make a lot of sense  
//var reg = XRegExp('[\uD83D\uDE01-\uD83D\uDE4F]', 'g'); //Range out of order in character class
//var reg = XRegExp('\\p{L}', 'g'); //Range out of order in character class
console.log(XRegExp.replace(str, reg, function(match){
    return encodeURIComponent(match);// here I want to have smth like that %F0%9F%98%84
}));