Extract substring in R using grepl Languages

Extract substring in R using grepl

I have a table with a string column formatted like thisAnd I would like to extract the last word in that filename. So I think the beginning pattern would be the word "Work" and ending pattern would be ".csv". I wrote something using grepl but not working.
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FizzBuzz Ruby one-liner Languages

FizzBuzz Ruby one-liner

Rosettacode.org has this excellent one-line FizzBuzz solution in Ruby.The trouble is, I don’t understand it. The part that puzzles me is the ”n to the power of 4 modulo -15”. Does anyone have an explanation or a reference to an explanation? I want to use this way of selecting substrings...
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