在记事本++中使用正则表达式来提取文本，如果没有找到

I have a large number of txt-files and aim to extract a certain piece of text out of each of them. I managed to this for most of my files using regex in notepad. I just use find-and-replace for all files in a folder using a pretty elaborate regex:

我有大量的txt文件,旨在从每个文件中提取一段文本。我在记事本中使用正则表达式为我的大部分文件设法了。我只是使用相当复杂的正则表达式对文件夹中的所有文件使用find-and-replace:

Find:

.*(pretty elaborate regex).*

Replace:

$1

This works great. However, some of my documents do not contain the specific piece of text I am looking for. Notepad will leave these documents unchanged. How can I let it put a text in these documents which says for example: "no_match_found"

这很好用。但是,我的一些文档中不包含我要查找的特定文本。记事本将保持这些文档不变。我怎么能让它在这些文件中加上一个文字,例如:“no_match_found”

Thanks for you help! Andreas

谢谢你的帮助!安德烈亚斯

2 个解决方案

#1

It is quite easy with the Boost conditional replacement pattern. Add a |(.*) alternative branch to your regex (make sure the . matches newline is ON) and use (?1$1:NO_MATCH_FOUND) pattern that will eaither insert the Group 1 value, or will just replace the whole document with the literal text NO_MATCH_FOUND.

使用Boost条件替换模式非常容易。在你的正则表达式中添加一个|(。*)替代分支(确保。匹配换行符为ON)并使用(?1 $ 1:NO_MATCH_FOUND)模式,该模式将插入Group 1值,或者只用整个文档替换整个文档文字文本NO_MATCH_FOUND。

Here is an example of what happens to a document having no match:

以下是没有匹配的文档会发生什么情况的示例:

#2

Maybe this post will help you: How to negate the whole regex?

也许这篇文章会帮助你:如何否定整个正则表达式?

Use negative lookaround: (?!pattern)

使用否定的外观:(?!pattern)

You can just match for the negated regex and place the text then

您可以匹配否定的正则表达式然后放置文本

#1