JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block"></div>

JavaScript

block = document.getElementById("block");

str = "matrix(1,0,0,1,0,0)";
obj = str.split("(")[1];
obj = obj.split(")")[0];
obj = obj.split(",");
obj[5] = "80";

objs = [];
objs.push(obj[0], obj[1], obj[2], obj[3], obj[4], obj[5]);
newStr = "matrix(" + objs.join() + ")";

block.innerHTML = newStr;