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  1. x <- c("On the Internet, nobody knows I'm a dog", "On the Internet, '''nobody''' knows I''m a ''''dog''''")
  2. gsub("''(*SKIP)(?!)|'", "''", x, perl=TRUE)
Success #stdin #stdout 0.23s 60752KB
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[1] "On the Internet, nobody knows I''m a dog"                
[2] "On the Internet, ''''nobody'''' knows I''m a ''''dog''''"
https://ideone.com/4zNaCe
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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