获得等同于GNU grep的最简单方法是支持负向倒序？ [英] What's the easiest way to get an equivalent to GNU grep that supports negative lookbehinds?

问题描述

我试图通过嵌套子目录中的一堆文件来寻找正则表达式匹配;我的正则表达式需要消极的lookbehind。

I'm trying to grep through a bunch of files in nested subdirectories to look for regular expression matches; my regex requires negative lookbehind.

Perl有负面的后视，但据我可以告诉 GNU grep不支持负向反向

Perl has negative lookbehind, but as far as I can tell GNU grep doesn't support negative lookbehinds.

什么是最简单的方法来获得相当于GNU grep，支持负向lookbehinds？

What's the easiest way to get an equivalent to GNU grep that supports negative lookbehinds?

（我想我可以在Perl中编写我自己的迷你grep，但那不是' t似乎应该是必要的，我的Perl Cookbook的副本包含了tcgrep的源代码;我应该使用什么？如果是这样，最新版本在哪里？不要告诉我必须输入整个程序！）

(I guess I could write my own mini-grep in Perl, but that doesn't seem like it should be necessary. My copy of the Perl Cookbook includes source for tcgrep; is that what I should use? If so, where's the latest version? Don't tell me I have to type this entire program!)

推荐答案

使用 ack ！ Ack是用Perl编写的，因此它使用Perl的正则表达式引擎（默认情况下）。

Use ack! Ack is written in Perl so it uses Perl's regex engine (by default).

负面后视是 ack（？< ;!坏）男孩（每willert的评论）

The negative look-behind is ack "(?<!bad)boy" (per willert's comment)

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