[英]Extract substring after matching pattern
I am trying to extract a substring after matching a pattern in a string. 我试图在匹配字符串中的模式后提取子字符串。
Now I can't share my hole file but let's take this example. 现在我无法分享我的孔文件,但让我们来看看这个例子。
From this string: 从这个字符串:
{"code":"S02A5","name":"18\" Leichtmetallräder Doppelspeiche 397","price":"0","standard":"false"}
I want to extract this substring 我想提取这个子字符串
18\" Leichtmetallräder Doppelspeiche 397
So far I tried the following : 到目前为止我尝试了以下内容:
This matches to many results 这符合许多结果
grep -oP '(?<="code":".....","name":")[^"]+'
I know that the first char after "name":" is always 1 , so I tried to use this in the following command, and the return is 8\\ which is not that bad because I can add the 1 afterwards. 我知道“name”之后的第一个字符:“总是1 ,所以我试着在下面的命令中使用它,返回是8 \\ ,这并不是很糟糕,因为我之后可以添加1 。
grep -oP '(?<="code":".....","name":"1)[^"]+'
The problem is that I can't find a way to retrieve the rest of the substring needed, because there's an extra quotation mark after that backslash. 问题是我找不到一种方法来检索所需的其余子字符串,因为在该反斜杠后面有一个额外的引号。
Any ideas how can I solve this? 任何想法如何解决这个问题?
That looks like JSON, use for example jq
: 看起来像JSON,例如使用
jq
:
$ jq '.name' file
"18\" Leichtmetallräder Doppelspeiche 397"
or 要么
$ jq -r '.name' file
18" Leichtmetallräder Doppelspeiche 397
Update : 更新 :
If you need to use grep
如果你需要使用
grep
$ grep -oP '(?<="name":")(\\"|[^"])+' file
18\" Leichtmetallräder Doppelspeiche 397
Explained: 解释:
(?<="name":")
positive lookbehind preceeded by "name":"
(?<="name":")
正面看后面是"name":"
\\"
s or non-quotes \\"
非\\"
或“非\\"
OR : 或者 :
Maybe it should be: 也许它应该是:
$ grep -oP '(?<="name":")((?<![^\\]\\)\\"|[^"])+' file
since that would match \\"
and \\\\\\"
but not \\\\"
因为那将匹配
\\"
和\\\\\\"
但不匹配\\\\"
If you are considering Perl, this should work 如果您正在考虑Perl,这应该可行
/tmp> export data='{"code":"S02A5","name":"18\" Leichtmetallräder Doppelspeiche 397","price":"0","standard":"false"}'
/tmp> echo $data | perl -ne ' /\"name\":(.+?),/ and print "$1\n" '
"18\" Leichtmetallräder Doppelspeiche 397"
/tmp>
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