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  1. text <- "are blue and then and then more and then and then more very bright"
  2. gsub("(?s)(\\b.+?\\b)\\1\\b", "\\1", text, perl=T) ## shorter repeated substrings
  3. gsub("(?s)(\\b.+\\b)\\1\\b", "\\1", text, perl=T) ## longer repeated substrings
Success #stdin #stdout 0.45s 79168KB
comments (?)
stdin 
Standard input is empty
stdout 
[1] "are blue and then more and then more very bright"
[1] "are blue and then and then more very bright"
https://ideone.com/SiKl4e
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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