Thanks for the patch. I once had the same pain on a similar task, I had to create a PL/SQL function at the time.
I haven’t read the code change yet, but I think the function name jsonb_translate() sounds to generic. To make the name more meaningful, I would suggest a few candidates: jsonb_replace_text(), or jsonb_replace_value(), or jsonb_deep_replace().
Also, I want to understand why do you decide to support only whole word matching?
With this patch, partial match will not result in a replacement.
That is on purpose. My use case for this is to replace categorical/enum values scattered deep inside the json structure.
Hence the name translate which usually means mapping from one key space to another.
Partial replacement wasn't the case for me, and most importantly I guess I could achieve the same by casting to text replacing and casting back to jsonb.
