I am cleaning up comma-limited values, so that only one comma
separates each value. Using the example below, as much as I try with
regex, I can't remove the last comma. I hope to have a one-liner
solution, if possible.
gsub("^,*|,*$|(,)*", "\\1", ",,,apple,,orange,,,,,lemon,strawberry,,,,")
[1] "apple,orange,lemon,strawberry,"
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