Edit requests of 初心者歓迎！手と目で覚える正規表現入門・その１「さまざまな形式の電話番号を検索しよう」

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We released Markdown parser changes on February 24, 2022. There may be some unexpected appearance changes in this update, because this article was posted before the changes.
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For more information on the changes, please read this article.