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  1. s = 'some example 2 .png'
  2. puts s.gsub(/\s+(\.[^.]+\z)|\s/) { $1 || "_" }
Success #stdin #stdout 0.02s 9768KB
comments (?)
stdin 
Standard input is empty
stdout 
some_example_2.png
https://ideone.com/O5MpWb
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
secret

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