JavaScript autocomplete without external library

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Here is a basic JavaScript example, which could be modified into an autocomplete control:

var people = ['Steven', 'Sean', 'Stefan', 'Sam', 'Nathan'];

function matchPeople(input) {
  var reg = new RegExp(input.split('').join('\\w*').replace(/\W/, ""), 'i');
  return people.filter(function(person) {
    if (person.match(reg)) {
      return person;
    }
  });
}

function changeInput(val) {
  var autoCompleteResult = matchPeople(val);
  document.getElementById("result").innerHTML = autoCompleteResult;
}
<input type="text" onkeyup="changeInput(this.value)">
<div id="result"></div>

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