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  1. text <- 'Extract all words but word1 and word2.'
  2. regmatches(text, gregexpr("(*UCP)\\b(?!(?:word1|word2)\\b)\\w+", text, perl=TRUE))
Success #stdin #stdout 0.22s 39768KB
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Standard input is empty
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[[1]]
[1] "Extract" "all"     "words"   "but"     "and"
https://ideone.com/QBfoR8
language:
R (R 3.5.2)
created:
5 years ago
visibility:
public

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