"111".gsub(/1?/, "2")
=> "2222"
"111".gsub(/1/, "2")
=> "222"
"111".gsub(/1*/, "2")
=> "22"
"111".gsub(/1+/, "2")
=> "2"
"111".gsub(/1?/, "2")
=> "2222"
"111".gsub(/
阅读背景：
gsub如何处理'*'、'+'和'?
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