問題：
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I don't really understand regular expressions.我真的不明白正則表達式。 Can you explain them to me in an easy-to-follow manner?你能用一種易於理解的方式向我解釋它們嗎？ If there are any online tools or books, could you also link to them?如果有任何在線工具或書籍，您是否也可以鏈接到它們？
解決方案：
參考一： https://en.stackoom.com/question/1EO參考二： https://stackoom.com/question/1EO