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  1. x <- c("not line_start 1 abc 2 def 4", "line_start 1 abc 2 def 4")
  2. regmatches(x, gregexpr("(?:\\G(?!^)|^line_start)\\D*\\K\\d+", x, perl=TRUE))
Success #stdin #stdout 0.22s 39532KB
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[[1]]
character(0)

[[2]]
[1] "1" "2" "4"
https://ideone.com/tlSNzs
language:
R (R 3.5.2)
created:
6 years ago
visibility:
secret

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