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  1. library(stringr)
  2. txt <- "bvwbjplbgvbhsrlpgdmjqwftvncz"
  3. str_extract(txt, "(.)(?!\\1)(.)(?!\\1|\\2)(.)(?!\\1|\\2|\\3)(.)")
Success #stdin #stdout 0.31s 42092KB
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Standard input is empty
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[1] "vwbj"
https://ideone.com/rQyx4j
language:
R (R 3.5.2)
created:
3 years ago
visibility:
secret

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