Thanks. Yes, all characters are acutally indexed, with some logic to split intelligently when required. It will always go for the most exact match first though.

I have started looking at ranking the main implementation over usage, but found the results were less useful generally. This may have just been me though, as I wanted to see usage rather then the implementation, since if I know that I will just go to the source.

Perhaps an option to request that the orginal source is given greater weight on an advanced search page would solve this.