fork(1) download 
  1. re = /(?:^.*:\R|\G)\K /
  2. str = 'list:
  3.   - first'
  4. result = str.gsub(re, ' ')
  5.  
  6. puts result
  7.  
Success #stdin #stdout 0.01s 6428KB
comments (?)
stdin 
Standard input is empty
stdout 
list:
  - first
https://ideone.com/Y8SJ6P
language:
Ruby (ruby 2.5.5)
created:
3 years ago
visibility:
secret

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