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  1. input = "123XyzXyzXyz123"
  2. gsub("(?:123|(?<!^)\\G)\\KXyz(?=(?:Xyz)*123)", "A", input, perl=TRUE)
  3.  
Success #stdin #stdout 0.42s 22824KB
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Standard input is empty
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[1] "123AAA123"
https://ideone.com/w3WJvr
language:
R (R 3.5.2)
created:
10 years ago
visibility:
public

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