JSFiddle - React, Tailwind, and code Playground
by Rahul Desai
JavaScript
var selectedText = "abc 123 abc123 123abc !@#abc !@#123 ! @ # $ % ^ & * ( as !@#!@# as";
var result = selectedText.replace(/(\s[a-zA-Z0-9]+)/g, " x" + "$1");
console.log(result);