Edit requests of HTML5のpattern属性で半角英数記号を指定するにはどう記述したら良いですか?

@alt

2019-02-22

Not reviewed

誤字訂正

Please check the preview of this article

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.
Please don't forget to check the preview before updating your article.
For more information on the changes, please read this article.