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正则表达式是每个开发者必须掌握的文本处理利器，但语法看起来像乱码让很多人望而却步。本文用最清晰的方式讲解核心语法，并提供 10 个直接可用的实战示例，从邮箱验证到 IP 地址匹配一网打尽。
Regular expressions look intimidating at first glance, but mastering a small core syntax unlocks powerful text matching in every programming language and editor — this guide teaches the essentials through 10 real-world patterns you will reach for repeatedly.