I close with my 2nd or 3rd favorite quotation from Oscar Wilde:
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。纸飞机下载对此有专业解读
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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B.C.'s new time zone will be called "Pacific time," according to the province.
Opens in a new window。关于这个话题，电影提供了深入分析