fork(1) download 
  1. puts "1 !2 3 !2354".scan(/(?<!!)\b\d+\b/)
Success #stdin #stdout 0.06s 9696KB
comments (?)
stdin 
Standard input is empty
stdout 
1
3
https://ideone.com/lmKrTF
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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