AR Script: Uppercase set word

const iWord = 2;

var regEx = /(\w+\W*)/g;// Regular expression, with the global option set
var sNewFilename = "";

// Run the regex and return it in an array
reReturn = item.newBasename.match(regEx);

for (var i = 0; i <= reReturn.length - 1;  i++ ) {
  if (i == iWord - 1){
    sNewFilename+= reReturn[i][0].toUpperCase() + reReturn[i].substring(1); }
  else
  {sNewFilename+= reReturn[i];}
  }

return sNewFilename;