如何使用RegEx在记事本中的两个单词之间添加“ _”

Question

I want to use Notepadd++ replace option with regular expression to accomplish this:

From: IntegrationName
To: Integration_Name

How can do this ?

My RegEx to search is: .[AZ] this finds: "oN" But I don't know what to put in the replace box so it will only add "_" between the "o" and the "N"...

Answer 1

Another solution using lookaround assertions would be:

(?<=[a-z])(?=[A-Z])

and replace with

_

Note : The "Match case" option needs to be active, otherwise Notepad++ will find a match between every two letters.

This regex will find every position where a lowercase is on the left and an uppercase is on the right.

Answer 2

You can make use of capture groups. If I have to take your current attempt and edit it as little as possible, you would get:

(.)([A-Z])

This will store the match of . into $1 and the uppercase letter in $2 , thus, you can use the following in the replace entry box:

$1_$2

Answer 3

I know you've accepted an answer , but when I ran it, I got From: _Integration_Name

Here's my idea;

(:\s)(.{1})([a-z]*)([A-Z]{1})

And use the following replace

$1$2$3_$4

Answer 4

I finaly did it like this:

Find: ([a-z])([A-Z])
Replace with: $1_$2