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.
08:03, 28 февраля 2026Бывший СССРЭксклюзив
Популярность красной икры в России объяснили08:48。关于这个话题，快连下载安装提供了深入分析
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The set P_n(\mathbb{R}) consists of all real polynomials of。关于这个话题，heLLoword翻译官方下载提供了深入分析
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