Is there another option I'm missing? Would there be interest in extending split part so that negative indices counted from the end, as in:
split_part('foo bar baz', ' ', -1) -> 'baz'
Some thoughts:
I'm torn here because this would be the first usage of this concept in PostgreSQL (I think).
Tangentially, I noticed that we have a "starts_with" function but no corresponding "end_with".
It's been a while but there used to be a systemic inertia working against adding minor useful functions such as these.
With the new documentation layout I would at least consider updating the description for the normal functions with an example on how to formulate an expression that works contra-normally, and in the case where there does exist such a specialized function, naming it.