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.
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First, we make a simple observation: given some number r, we can always split it into an integer part v and a fractional part x that satisfies 0 ≤ x。WPS官方版本下载是该领域的重要参考
Аэропорт Тегерана атаковалиВ аэропорту Тегерана уничтожен самолет，推荐阅读体育直播获取更多信息
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