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正規表現で特定の文字列を含まない表現にマッチさせる方法

以下の記事の中で重要と思ったことを抜粋
[正規表現] .*?は最短マッチではない

特定の文字を含まない表現にマッチさせる方法

例:[^Aa]* Aとaを含まない表現にマッチ

<<<hoge>>><hoge>部分にマッチさせる方法
<[^<>]*>

特定の文字列を含まない表現にマッチさせる方法

(?:(?!文字列1|文字列2).)* または
((?!文字列1|文字列2).)* マッチさせるだけなら?:は無くても良い または
((?!(文字列1|文字列2)).)* かっこがあっても良い
文字列1と文字列2を含まない表現にマッチ

<em>あ<em>いうえ</em>お</em><em>いうえ</em>部分にマッチさせる方法
<em>((?!<em>|</em>).)*</em>

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