^（脱字符）与 $（美元符）是 JavaScript 正则表达式中最基础也最容易产生误解的两个“锚点”。本文以 Modern JavaScript Tutorial 仓库中 正则表达式任务 "Regexp ^$"及其 官方解答为主线，从“空字符串是唯一匹配”这个反直觉结论出发，彻底讲清锚点的“零宽”本质 ...

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