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... \s*([^,]+)\s*,...
Find some whitespace, or perhaps none at all.
...
which *includes* whitespace, then...
Find some more whitespace, perhaps none
Find a comma

m#(?:[^,]*,\s*){3}(.*?)\s*,#

(?:        ## Group, but do not store it into $1
[^,]*      ## Anything that is not a comma
...
(.*?)      ## Match any character, but don't be so greedy about it
\s*        ## Possible whitespace
,          ## Stops at first comma, because we are not being greedy