function tokenize(text){ 
  var puncRE = /([ \?!,\.]+)/;
  var bits = text.split(puncRE);
  var words = [];
  for (var i=0;i<bits.length;i++)
    if (bits[i].length > 1 && !(bits[i].match(puncRE))) 
      words.push(bits[i]);
  return words;
}