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.
На Украине заявили о «топливной лихорадке»08:39
，这一点在电影中也有详细论述
Father claims Google's AI product fuelled son's delusional spiral
Where did Wordle come from?Originally created by engineer Josh Wardle as a gift for his partner, Wordle rapidly spread to become an international phenomenon, with thousands of people around the globe playing every day. Alternate Wordle versions created by fans also sprang up, including battle royale Squabble, music identification game Heardle, and variations like Dordle and Quordle that make you guess multiple words at once.
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Зеленский заявил о запросе от США на участие Киева в ситуации на Ближнем Востоке20:47