(Oops, shouldn't have used "/c" in benchmark, and should have noticed unrealistic results for such a long input. I'm sorry. Copied "/cg" and "\G" from RL code, thought maybe it's relevant for how "/o" behaves. The premise in the title is still the same.)

Thanks for the link, that's scary. Perhaps I'd better not "split" a regex into smaller chunks, let it stay long.