That example is nice and short, but the poll! macro isn't common in real
Backtracking: everyone in the field knows that backtracking engines (PCRE, java, dotnet, javascript, PHP, ruby, python..) are bad because they are the poster child of denial of service attacks. O(2^n) match time complexity is not good. most backtracking implementations are a combination of clever optimizations duct taped to a very slow engine - for simple cases it works well, but using a pattern that is not affected by the optimizations, you get to see what the “real” worst-case behavior looks like.，详情可参考快连官网
Силовые структуры。关于这个话题，PDF资料提供了深入分析
She has since returned to her home county and reflected on a "really stressful couple of days".