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  1. puts "{{hello}".gsub(/(?<!{){{[^{}]+}(?!})/, "\\0}")
Success #stdin #stdout 0.08s 9656KB
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stdin 
Standard input is empty
stdout 
{{hello}}
https://ideone.com/Z4nxea
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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