Replace a character in all JSON values in a dict in Notepad++ using regex

Question

My goal is to replace 1 case-sensitive character in all the values in a JSON file but not the keys.

So my thought process is like this:

1. Highlight the part I want using: (?<=\:)(.*?)(?=\,)

2. Search for just "R": (?<=\:)(.*?)(.R)(?=\,)

Step 2 should work but doesn't?

Something that replaces it with "T"

This is the input:

{
Hello: Rool,
MyKey1: Something
}

This is the expected output:

{
Hello: Tool,
MyKey1: Something
}

I appreciate any help I can get with this.

Answer 1

Try this ....
Find: (?<=: )R(.*?)(?=,)
Replace with: T$1

Or without using captured group ...

Find: (?<=: )R(?=.*?,)
Replaced with: T