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  1. x <- c("Anna & x, Anna & x", #
  2.        "Alb, Berta 222, Alb", 
  3.        "Al Pacino", 
  4.        "Abb cd xy, Abb cd xy, C123, C123, B")
  5.  
  6. library(stringr)
  7. str_extract_all(x, "([^\\s,](?:[^,]*[^\\s,])?)(?!.*\\1)")
Success #stdin #stdout 0.27s 41860KB
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Standard input is empty
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[[1]]
[1] "Anna & x"

[[2]]
[1] "Berta 222" "Alb"      

[[3]]
[1] "Al Pacino"

[[4]]
[1] "Abb cd xy" "C123"      "B"
https://ideone.com/47gbop
language:
R (R 3.5.2)
created:
4 years ago
visibility:
public

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