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  1. a <- c("I need             only                <5                         white-spaces   removed")
  2. gsub("(?<=\\S)\\s{1,4}(?=\\S)", "", a, perl=TRUE)
Success #stdin #stdout 0.21s 39756KB
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[1] "Ineed             only                <5                         white-spacesremoved"
https://ideone.com/Pk2bho
language:
R (R 3.5.2)
created:
5 years ago
visibility:
secret

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