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  1. regmatches("line_start 1 abc 2 def 4", gregexpr("(?:\\G(?!^)|^line_start)\\D*\\K\\d+", "line_start 1 abc 2 def 4", perl=TRUE))
  2. library(stringr)
  3. stringr::str_extract_all("line_start 1 abc 2 def 4", "\\G\\D*?(\\d+)")
Success #stdin #stdout 0.24s 42364KB
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[[1]]
[1] "1" "2" "4"

[[1]]
[1] "line_start 1" " abc 2"       " def 4"
https://ideone.com/t3YzbM
language:
R (R 3.5.2)
created:
4 years ago
visibility:
secret

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