keypath parser.js

function keypath(input) {
  var regex = /(\w+)|\[([^\]]+)\]/g;
  var result = [];
  var path;

  while ((path = regex.exec(input || ''))) {
    if (input[path.index] === '[') {
      result.push(path[2]);
    }
    else {
      result.push(path[1]);
    }
  }

  return result;
}