JSFiddle - React, Tailwind, and code Playground

JavaScript

var count = 0;
    var matches;
    var transcript = "e1b2xx4d3";
    var transcript1 = transcript;
    regex = /\d+/g;
    while ((matches = regex.exec(transcript)) !== null) {
        transcript1 = transcript1.replace(matches[0], count++);
    }
    console.log(transcript1);