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  1. input = "  aa   asdf        hello world
  2. aabf    adnbfsgn
  3.    asdf
  4. ";
  5. input.gsub!(/(?:^ {2})|\G {2}/m,"x")
  6. puts input
  7.  
Success #stdin #stdout 0s 4760KB
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stdin
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Standard input is empty
stdout
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xaa   asdf        hello world
aabf    adnbfsgn
x asdf
https://ideone.com/oZ4Os
language:
Ruby (ruby 2.5.5)
created:
11 years ago
visibility:
public

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