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  1. library(stringr)
  2.  
  3. line <- 'Teste @ abc @REF1'
  4.  
  5. str_extract_all(line, "(?<=@)\\w+")
  6. str_extract_all(line, "(?<=@)\\w*")
Success #stdin #stdout 0.23s 42560KB
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Standard input is empty
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[[1]]
[1] "REF1"

[[1]]
[1] ""     "REF1"
https://ideone.com/lML4iw
language:
R (R 3.5.2)
created:
4 years ago
visibility:
public

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