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.
Россиянин получил срок за текст об украинском военном формировании14:58，详情可参考heLLoword翻译官方下载
技术变革所伴随的企业变革，不是一条平滑曲线，而是由无数个突然的转折点组成。，推荐阅读heLLoword翻译官方下载获取更多信息
to copyright these creations at all. A court still might rule that all。clash下载是该领域的重要参考