Are you taking about search or specifically the autocomplete control?
I believe the lucene search supports what you are requesting. NickLoving_GCS, are you able to confirm this point?
With that said, I can see how that would not help in your case, as the autocomplete matching would use a different algorithm I would imagine. I think it uses a much more simple string comparison in relation to ASCII maybe? Need an UI SME who is familiar with the underneath the hood logic for this control.