gsubがブロック受けれるの今更ながらに知ったのでメモ
list = ['AlphaBeta', 'FooBar']
# => ["AlphaBeta", "FooBar"]
list.map { |item| item.gsub(/^[A-Z]/) { |i| i.downcase } }
# => ["alphaBeta", "fooBar"]
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