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  1. x <- c("ab", "abc", "abcc", "abccc", "abcccc", "abccccc")
  2. grep(pattern="(^|[^c])c{2,3}([^c]|$)", x, value=TRUE)
  3. grep(pattern="(?<!c)c{2,3}(?!c)", x, value=TRUE, perl=TRUE)
Success #stdin #stdout 0.15s 175424KB
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Standard input is empty
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[1] "abcc"  "abccc"
[1] "abcc"  "abccc"
https://ideone.com/yfuFaP
language:
R (R 3.5.2)
created:
9 years ago
visibility:
public

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