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Help us understand the problem. What are the problem?

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@kuroko918

pattern要素の使い方(正規表現を属性に入力する場合)

特定の文字を含む

pattern = "^[a-zA-Z0-9 ]+\\S$$"

「^...」は「...で始まる」という意味。
「[a-zA-Z0-9 ]」は「小文字・大文字の全角アルファベット、全角数字を含む」という意味。
「...+」は「...を一回以上含む」という意味。
「\S$」は「空白文字(半角スペース、全角スペース、タブ、改行、改ページ)で終わらない」という意味。

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Help us understand the problem. What are the problem?