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  1. txt2 <- "useRs may fly into JFK or laGuardia"
  2. id <- 3
  3. sub(paste0("((?:\\w+\\W+){", id-1, "})(\\w)(\\w*)(\\w)"), "\\1\\U\\2\\E\\3\\U\\4", txt2, perl=TRUE)
  4.  
Success #stdin #stdout 0.24s 39148KB
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[1] "useRs may FlY into JFK or laGuardia"
https://ideone.com/SGa4W7
language:
R (R 3.5.2)
created:
6 years ago
visibility:
public

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