>Also - instead of using Occurs() and the successive At(...., occurrence) which traverse the string many times (once for Occurs and each time for At)
>consider using a RegEx that returns a matches collection. ( RegEx adds some overhead, but the string will be traversed once. It also lets you specify ignoreCase)

RegEx is too specific to .NET. This one would cause too much problems when moving into another environment. We have found this was related to a very big string that the UCase() was not able to handle.