grep：重复操作符操作数无效 [英] grep: repetition-operator operand invalid

问题描述

我有这个正则表达式（？<= heads \ /）(.*?)(?=\\\
），你可以看到它在这里工作
http://regexr.com?347dm

  $ grep -Eio'这个正则表达式在grep命令中工作，但我得到这个错误。 （？<= heads \ /）(.*?)(?=\\\
）'text.txt 
 grep：重复操作符操作数无效
  

它在ack中工作的很好，但我没有对我需要运行的机器进行验证。

  ack text.txt -o --match'（？<= heads \ / )(.*?)(?=\\\
）'
  

text.txt

  74f3649af36984e1b784e46502fe318e91d29570 HEAD 
 06d4463ab47a6246e6bd94dc3b9267d59fc16c2e refs / heads / ARC 
 0597e13c22b6397a1b260951f9d064f668b26f08 refs / heads / LocationAge 
 e7e1ed942d15efb387c878b9d0335b37560c8807 refs / heads / feature / 311-312-breaking-banner-updates 
 d0b2 632b465702d840a358d0b192198ae505011c裁判/头/海湾新闻
 509173eafc6792739787787de0d23b0c804d4593裁判/头/ JBB-新的applicationDidFinishLaunching 
 1e7b03ce75b1a7ba47ff4fb5128bc0bf43a7393b裁判/头/ locationdebug 
 74f3649af36984e1b784e46502fe318e91d29570裁判/头/主
 5d2ede384325877c24db7ba1ba0338dc7b7f84fb裁判/头/混合媒体
 3f3b6a81dd3baea8744aec6b95c2fe4aaeb20ea3裁判/头/-onezero后
 4198a43aab2dfe72d7ae9e9e53fbb401fc9dac1f裁判/头/白色标签
 76741013b3b2200de29f53800d51dfd6dc7bac5e裁判/标签/ R10 
 fc53b1a05dad3072614fb397a228819a67615b82裁判/标签/ R10 ^ {} 
 afdcfd970c9387f6fda0390ef781c2776aa666c3 refs / tags / r11 
  

解决方案

grep does不支持（？< = ...）或 *？或（？ = ...）运算符。请参阅此表格。

I have this regular express (?<=heads\/)(.*?)(?=\n) and you can see it working here http://regexr.com?347dm

I need this regex to work in the grep command but I'm getting this error.

$ grep -Eio '(?<=heads\/)(.*?)(?=\n)' text.txt 
grep: repetition-operator operand invalid

It works great in ack but I dont have ack on the machine I need to run this on.

ack text.txt -o --match '(?<=heads\/)(.*?)(?=\n)'

text.txt

74f3649af36984e1b784e46502fe318e91d29570    HEAD
06d4463ab47a6246e6bd94dc3b9267d59fc16c2e    refs/heads/ARC
0597e13c22b6397a1b260951f9d064f668b26f08    refs/heads/LocationAge
e7e1ed942d15efb387c878b9d0335b37560c8807    refs/heads/feature/311-312-breaking-banner-updates
d0b2632b465702d840a358d0b192198ae505011c    refs/heads/gulf-news
509173eafc6792739787787de0d23b0c804d4593    refs/heads/jbb-new-applicationdidfinishlaunching
1e7b03ce75b1a7ba47ff4fb5128bc0bf43a7393b    refs/heads/locationdebug
74f3649af36984e1b784e46502fe318e91d29570    refs/heads/master
5d2ede384325877c24db7ba1ba0338dc7b7f84fb    refs/heads/mixed-media
3f3b6a81dd3baea8744aec6b95c2fe4aaeb20ea3    refs/heads/post-onezero
4198a43aab2dfe72d7ae9e9e53fbb401fc9dac1f    refs/heads/whitelabel
76741013b3b2200de29f53800d51dfd6dc7bac5e    refs/tags/r10
fc53b1a05dad3072614fb397a228819a67615b82    refs/tags/r10^{}
afdcfd970c9387f6fda0390ef781c2776aa666c3    refs/tags/r11

解决方案

grep does not support the (?<=...) or *? or (?=...) operators. See this table.

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