So we had the XML namespace in the standard library, and that contained elementtree and Celementtree, which was the C implementation that was faster but had some different functionality.
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you notice the orientation of the arrows changing in the second plan? This is because the model we use is push-based.。关于这个话题，服务器推荐提供了深入分析
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.