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  1. (0..255).each{|n|
  2. bin = n.to_s(2)
  3. puts "#{bin}" if /(?=^1*(01*0)*1*$)^.(..)*$/=~bin
  4. }
Success #stdin #stdout 0.01s 7420KB
stdin
Standard input is empty
stdout
1
100
111
10000
10011
10101
10110
11001
11010
11100
11111
1000000
1000011
1000101
1000110
1001111
1010001
1010010
1010111
1011000
1011011
1011101
1011110
1100001
1100010
1100111
1101000
1101011
1101101
1101110
1110000
1110011
1110101
1110110
1111001
1111010
1111100
1111111