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  1. sa<-c("100 dollars for 200 pesos", "100 dollars 200 pesos")
  2. regmatches(sa, regexpr("dollars\\D*\\K\\d+", sa, perl=TRUE))
Success #stdin #stdout 0.19s 178496KB
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Standard input is empty
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[1] "200" "200"
https://ideone.com/QLan3e
language:
R (R 3.5.2)
created:
8 years ago
visibility:
secret

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