this isn’t just an academic curiosity. flip the alternation order to (ab|a)+ and suddenly PCRE matches the entire string! the | operator in backtracking engines is ordered - it’s not union, it’s “try left first”. the order of branches changes the result, which means | is not commutative. a|b and b|a can give different matches.
02:37, 4 марта 2026Мир
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工具的成型研究材料都备齐了，接下来就是写一个小工具，用来做资源编辑和替换。整个工具是用 Svelte 搞的，我基本也没亲自动手写，直接让 LLM 帮忙做了简单的组件封装，界面突突突就给做出来了。说真的我也没太在乎美丑，就是个实用工具而已。
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