回答編集履歴
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調整
answer
CHANGED
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@@ -1,5 +1,6 @@
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1
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```javascript
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2
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const url="https://www.amazon.co.jp";
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3
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//const reg=/(?<=^https:\/\/www\.)amazon(?=\.co\.jp$)/; ※まちがい
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3
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const reg=/(?<=^https:\/\/www\.)
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const reg=/(?<=^https:\/\/www\.).+?(?=\.co\.jp$)/;
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console.log(url.match(reg)[0]);
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```
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```
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