I'm trying to use tr in bash to replace only the final character of a match. The string will have a substring with 5 digits followed by a dash, but I want to replace that dash with a slash.

I want to use something like this:

echo "xyzvb12345-Ab-C5678-dEf" | tr "#####-" "#####/"

To get an output like this:

xyzvb12345/Ab-C5678-dEf

Is there a way to do this with tr? Or maybe sed?

EDIT: This is not a duplicate of the many tickets out there that merely find and replace text. Please read carefully before marking as a duplicate.