问题描述
我试图从这种字符串中提取 ou =人，ou =（。*），dc = company，dc = org 最后一个字符串前面有昏迷没有后跟（。*）。在最后一种情况下，这应该给 dc = company，dc = org 。
I am trying to extract from this kind of string ou=persons,ou=(.*),dc=company,dc=org the last string immediately preceded by a coma not followed by (.*). In the last case, this should give dc=company,dc=org.
看看正则表达式，这似乎成为负面展望背后（前面）的正面看法。
Looking on regex, this seems to be a positive look behind (preceded by) of a negative look ahead.
所以我实现了这个正则表达式：（？< =（ ，（？！。* \ Q（。*）\ E）））。* ，但它返回，dc = company，dc = org 昏迷。我想要没有昏迷的同样的事情。我做错了什么？
So I have achieve this regex: (?<=(,(?!.*\Q(.*)\E))).*, but it returns ,dc=company,dc=org with the coma. I want the same thing without the coma. What I am doing wrong?
推荐答案
似乎我单独解决了我的问题，取消了前方负面看法周围的捕获组。它给出了以下正则表达式：（？< =，（？！。* \ Q（。*）\ E））。* 。
It seems that I have solved my problem alone, removing the capturing group around the negative look ahead. It gives the following regex: (?<=,(?!.*\Q(.*)\E)).*.
它与周围捕获组的行为相关联，如下所述：部分 Lookaround Is Atomic 。
It is linked with the behavior of capturing groups in look arounds as explained here: http://www.regular-expressions.info/lookaround.html in the part Lookaround Is Atomic.
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