本文目标

如何使用本教程

正则表达式到底是什么？

入门

测试正则表达式

元字符

字符转义

重复

字符类

反义

替换

分组

后向引用

零宽断言

负向零宽断言

注释

贪婪与懒惰

处理选项

平衡组/递归匹配

还有些什么东西没提到

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