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As a first pass, a "match whole words" checkbox should suffice. Eventually you might want a syntax that allows more flexibility, whether full regexes or something more scalable, but "match whole words" would solve a large fraction of the problem. (You might even want to make that the default, and have a checkbox for "match partial words" instead; for code search, I'd bet that most of the time you want the whole word matches.)

That sounds reasonable. I will probably go with that. Added to the queue and thanks for the feedback.

Perhaps support regex search? Russ Cox did a write up of how he implemented regex search for Google Code, back when that was a thing.

Yes I have looked at that. The catch is it would require another copy of the index, and I don't quite want to front the cash for that.

I did write some code which would turn a regex query into a normal sphinx query some time ago so I am going to try to implement that again and hopefully get similar results.

A better solution would probably be to just rank exact matches higher.