JSFiddle - React, Tailwind, and code Playground

by djp3d

JavaScript

var key = "s"
            
            var s = key.toUpperCase();
            var reg = "(\\" + s + ")";

            if (key.length > 0) {

                if (!isNaN(key.charAt(0))) {
                    reg = "(" + s + ")";
                }
                
								if (key.charAt(0).match(/^[0-9a-z]+$/)) {
                	reg = "(" + s + ")";
                }

            } else {

            }
            
            console.log("s: "+s);
            console.log("reg: "+reg); 
            console.log("isNaN(key.charAt(0)): "+isNaN(key.charAt(0)));