For this sort of thing you are looking for patterns you can use. More samples are better for that.
From just the one, the "KM action" version of @ComplexPoint's JavaScript split would be:
If you think the -s are a more reliable splitter you could do:
...which looks really verbose, but is nothing more than "take the first three - delimited items and join them together with a -.
And there's the ever-fun RegEx version of the same:
