[CLOSED]Make a Person with regex not working

Tell us what’s happening:
As a standalone line in the terminal, my setter works fine, however, in this context the program throws me an invalid regex group error. Don’t know why, honestly, help please.

Your code so far

let Person = function(firstAndLast) {
  // Complete the method below and implement the others similarly
  let fullName = firstAndLast;

  this.getFirstName = function() {
    return fullName.split(" ")[0];
  this.getLastName = function() {
    return fullName.split(" ")[1]
  this.getFullName = function() {
    return fullName;
  this.setFirstName = function(first) {
    fullName = first.concat(fullName.split(/(?=\s)/)[1]);
  this.setLastName = function(last) {
    fullName = fullName.split(/(?<=\s)/)[0].concat(last);
  this.setFullName = function(firstAndLast) {
    fullName = firstAndLast;
  return firstAndLast;

let bob = new Person('Bob Ross');

Your browser information:

User Agent is: Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0.

Link to the challenge:

When I run your code in Chrome, all tests pass.

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