How to leave only five-digit numbers in lines in Notepad++

In this article, we will look at how to leave only five-digit numbers in lines in Notepad++ using regular expressions, keeping their placement by lines. Notepad++ Download

Open Notepad++ and load the file in which you need to leave only five-digit numbers.
Go to the Search menu and select Replace.
In the opened window, enable the Search Mode option and select Regular expression.
In the Find field, enter the regular expression:

.*?(\b\d{5}\b).*?(\R|$)

.*? – matches any number of characters, as few as possible.
\b\d{5}\b – matches a five-digit number.
\R – matches any newline character.
$ – matches the end of the line.
In the Replace with field, enter:

\1\2

\1 – inserts the found five-digit number.
\2 – inserts a newline character.

Search and replace

To search for all elements matching the regular expression, click the Find All in Current Document button.
To replace all found elements, click the Replace All button.

Example

Suppose we have the text:
```
12345
abc 67890 def
123 4567 89123
```
After running the code, we will get a text where only five-digit numbers remain:
```
12345
67890
89123
```

With the correct regular expression, you can leave only five-digit numbers in the lines, keeping their placement by lines.