pixels create worker2 --from mybox:ready
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.
。业内人士推荐搜狗输入法下载作为进阶阅读
从事旅馆业经营活动有下列行为之一的，对其直接负责的主管人员和其他直接责任人员处一千元以上三千元以下罚款；情节严重的，处五日以下拘留，可以并处三千元以上五千元以下罚款：
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