Hackereacth - Benny And Shopping Solution in Javascript

bennyandshopping.js

var first = '4';
var two = 'I want to buy Microsoft for $10000';
var three = 'this house costs $0 5 0 00 0 Just buy it';
var four =  '$ 1 2 3 4 5 6 7 8 9 hello123';
var five = 'the cost is zero $ 0 0 0 0 0 0';

function main(input) {
    //Enter your code here
    var dollar = '$';
    output = input.replace(/\D/g,'');

    if(output.length != 1){
        if(output.match(/[^0]/g) === null){
            output = '$0';
            return output;
        }
        else{
            dollar = '$';
            dollar += output;
            output = dollar;
            r = /^\$[0]?\.?[0]/;
            while(r.test(output) === true){
                output = output.replace('$0','$');
                output = output.concat('0');
            }
        return output;
        }
    }
    return ''
}

console.log(main(first));
console.log(main(two));
console.log(main(three));
console.log(main(four));
console.log(main(five));