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regexp map是一种特殊的数据结构，其key可以是字符串或正则表达式，用于满足特定业务需求。文章记录了从需求到实现再到性能优化的全过程。
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regexp map 是由于一个奇怪的业务需求所诞生的数据结构。key可以是string或者一个正则表达式。TechStack背后的故事: 因需求诞生的特殊数据结构:正则Map 这篇文章记录了从需求到第一版实现，再到分析具体业务来进去性能优化。
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