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  1. text=c("hello, please keep THIS","THIS is important","all THIS should be done","not exactly This","not THHIS", "THAT is something I need, too")
  2. matches <- regmatches(text, gregexpr("\\b(THIS|THAT)\\b", text))
  3. res <- lapply(matches, function(x) if (length(x) == 0) NA else x)
  4. res[is.na(res)] <- ""
  5. unlist(res)
  6.  
Success #stdin #stdout 0.22s 60768KB
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Standard input is empty
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[1] "THIS" "THIS" "THIS" ""     ""     "THAT"
https://ideone.com/AUTQ0q
language:
R (R 3.5.2)
created:
9 years ago
visibility:
secret

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