Putting a + there instead of a * means that 
    "foo","bar"

[download]
is split into a single element: 
     foo","bar

[download]
which is highly unlikely to be wanted.

In reply to Re^3: split on comma-separated fields, where a field may have commas inside quotes by JavaFan
in thread split on comma-separated fields, where a field may have commas inside quotes by argv

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