关于“零宽度断言”

有时候我们会看到使用术语“锚（anchor）”来表示匹配位置而不是字符的元字符（参见：正则表达式中的位置元字符）。

在某些文档（如，介绍 .NET 正则表达式功能的文档）中，同是这些位置元字符，也会被称作“原子零宽度断言（atomic zero-width assertions）”。

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