JSFiddle - React, Tailwind, and code Playground
HTML
The value of str1 is : '<span id="str1"></span>'
<br/>
The value of str2 is : '<span id="str2"></span>'
JavaScript
var str = "abadaf";
var str1 = str.replace("a","c");
$("#str1").text(str1);
var str2 = str.replace(/a/g, "c");
$("#str2").text(str2);