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  1. r = /([1-3])(?!\1)([1-3])(?!\1|\2)([1-3])(?!\1|\2|\3)/ 
  2. r =~ "123"; puts($&)
  3. r =~ "132"; puts($&)
  4. r =~ "213"; puts($&)
  5. r =~ "231"; puts($&)
  6. r =~ "312"; puts($&)
  7. r =~ "321"; puts($&)
  8. r =~ "111"; puts($&)
  9. r =~ "122"; puts($&)
Success #stdin #stdout 0.01s 7460KB
comments ()
stdin 
Standard input is empty
stdout 
123
132
213
231
312
321
https://ideone.com/T8Zxww
language:
Ruby (ruby 2.5.5)
created:
12 years ago
visibility:
public

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