Replacing characters inside of a string

I have a requirement to change some character fields in a file. Leave the first and last character as is and replace all the between characters with a fill character such as an asterisk.

For example:

'Jack' = 'J**K'
'iSeries = 'i*****s'

I'm testing SQL statements with hard-coded strings. I thought I had a solution with TRANSLATE because it has a fill character parameter but it wants to translate the 1st and last characters if they happen to match one of the between characters. I don't know where to begin with perhaps REGEXP_REPLACE. I'm back at square one now and don't see any straightforward SQL methods to do this. I know this can be done with RPG but hoping to do this without 'code'.

TIA
Jack



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