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.
The DOS memory functions are simple enough. The ALLOC function takes the desired size in paragraphs, and either returns a pointer to newly allocated memory in the AX register, or returns an error code in AX and the size of the largest free block in the BX register.。关于这个话题，WPS官方版本下载提供了深入分析
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the result is RE#, the first general-purpose regex engine to support intersection and complement with linear-time guarantees, and also the overall fastest regex engine on a large set of benchmarks. we also wanted to address some more things along the way, like returning the correct matches (the ones you meant, leftmost-longest), when the default semantics are given by the PCRE implementation. or put another way, “it’s correct if it does whatever the one that blows up and causes denial of service does”.。关于这个话题，下载安装汽水音乐提供了深入分析
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