How to remove all letters except the first one in each line in Notepad++

In this article, we will look at how to remove all letters except the first one in each line in Notepad++. Notepad++ Download

Open Notepad++ and load or open the file in which you want to make changes.
Press Ctrl+H or select Search > Replace... to open the Replace window.
In the Find field, enter the following regular expression:
```
([A-Za-z])(.*)
```
In the Replace with field, enter:
```
\1
```
Make sure the Search Mode option is set to Regular expression.
Click Replace All to perform the replacement in all lines.

Detailed explanation:

The regular expression ([A-Za-z])(.*) works as follows:

([A-Za-z]) - captures the first letter in the line. Here, [A-Za-z] denotes any Latin character in upper or lower case.
(.*) - captures all subsequent characters in the line.

In the Replace with field, \1 is used to replace the entire line with only the first captured letter. Example:

Suppose you have the following text:

abc
def
ghi

After performing the replacement, the result will be:

a
d
g

Using the above steps, you can remove all letters except the first one in each line of text in Notepad++.