这是最容易出错的地方：初学者常以为" Java 后面没有 script，所以满足'不是 script'的条件"。但正则引擎是按字符逐个消费的，排除型字符集 必须实实在在匹配一个字符 ，它不能匹配"空"。"字符串结束"不是字符，所以整体匹配失败，返回 null。

本内容遵循CC 4.0 BY-SA版权协议 周五晚上，小刘抱着电脑来找我：“杨工，我改一个对象里的列表，结果另一个对象也跟着变了，这是见鬼了吗？” 我笑了：“没见鬼，你这是浅拷贝。” 第一幕：搬家那天 小刘租的房子到期，要搬去新小区。 他有两样东西： ...

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