1文字ずつ分割するなら簡単だけど、2文字以上で分割するにはどうするんだっけ？と思い調べてみた。
1文字ずつ分割する場合
s = "1234567890"
s.split(//)
=> ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]
n文字ずつに分割する場合
s = "1234567890"
n = 3
s.scan(/.{1,#{n}}/)
=> ["123", "456", "789", "0"]
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