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  1. x <- c("feel", "agre", "degree")
  2. rx <- "^(?:[^e]*e){2}[^e]*$"
  3. grep(rx, x, value = TRUE)
Success #stdin #stdout 0.24s 175424KB
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[1] "feel"
https://ideone.com/MuxhFx
language:
R (R 3.5.2)
created:
6 years ago
visibility:
secret

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