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対象の文字列から指定した文字を取り出すscanメソッド

Posted at

対象となる文字列や、文字列を代入した変数から指定した文字を取り出し、その数を出力する方法を記述していきます。

comment = "great good bad good good"

例として上記のような形でcomment変数に入ったgoodの数を知りたい時は次のようにscanメソッドが使用できます。

comment.scan("good").length

=>3

scanメソッドは文字列を配列の形で取り出します。

comment.scan("good")

=> ["good", "good", "good]

なのでlengthを用いて要素の数を取り出しています。

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