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  1. puts 'b a b'.gsub(/\b(?<!\$)a\b/, "B")
  2. puts 'b $a b'.gsub(/\b(?<!\$)a\b/, "B")
Success #stdin #stdout 0.05s 9656KB
comments (?)
stdin 
Standard input is empty
stdout 
b B b
b $a b
https://ideone.com/zpPcrl
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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