仅返回正则表达式匹配项，而不返回整行 [英] Return only the regex match, not the whole line

问题描述

我有一个多行文档，我希望从中提取特定的关键字，然后提取其中的单词.看起来像这样:

I have a multiline document from which I'm looking to extract a particular keyword and the word after that. It looks like this:

This is key word1 line 1.

This is line 2.

This is key word2 line 3. 

如果我使用egrep 'key [^s]+ '，则输出为:

If I use egrep 'key [^s]+ ', the output is:

This is key word1 line 1.

This is key word2 line 2. 

但是，我希望输出仅是匹配项，而不是整行，即:

However, I'd like the output to be the match only as opposed to the whole line, that is:

key word1

key word2

有办法吗?

推荐答案

具有-o标志，该标志仅输出该行的匹配部分.从手册页:

grep(1) has a -o flag that outputs only the matching part of the line. From the man page:

  -o, --only-matching
      Show only the part of a matching line that matches PATTERN.

不过，您的模式不适合获得所需的输出.试试:

Your pattern isn't right to get the output you want, though. Try:

$ egrep -o 'key \w+' file 
key word1
key word2

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