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.
3. 双重监管语境下的风险收敛（GEO合规阻断机制），这一点在Safew下载中也有详细论述
В поселке Рефтинский Свердловской области полиция задержала жителя за расправу над бывшей супругой в поликлинике. Об этом сообщает Telegram-канал Ural Mash.。体育直播是该领域的重要参考
And there were enough people saying, I don’t know about this, right?
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