如何grep出可以改变的子字符串? [英] How to grep out substring which can change?

问题描述

基本上我有一个非常大的文本文件，每一行都包含

Basically I have a very large text file and each line contains

tag=yyyyy;id=xxxxx;db_ref=zzzzz; 

我想要的是 grep 出 id，但是 id 的长度和形式可以改变，我想知道是否可以使用 grep -o 然后 grep for "id=" 然后提取它之后的所有内容，直到分号?

What I want is to grep out the id, but the id can change in length and form, I was wondering if its possible to use grep -o and then grep for "id=" then extract everything that comes after it until the semicolon?

推荐答案

你可以这样做:

$ grep -o 'id=[^;]*' file

如果您不想包含 id= 部分，您可以使用正 后视:

And if you don't want to inlcude the id= part you can using positive look-behind:

$ grep -Po '(?<=id=)[^;]*' file

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