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.
陈宜芳：人民法院始终高度重视未成年人保护工作，立足审判职能，积极配合专门教育和专门学校建设。
。关于这个话题，雷速体育提供了深入分析
Популярность красной икры в России объяснили08:48
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