Description of the Issue

Replace will not actually replace the character.

Steps to Reproduce the Issue

1. Open new txt file
2. Add two lines fo example:
   2020-08-31-09:24:26,5.23,4.22,3.64,26
   2020-08-31-09:24:27,0.00,0.00,0.00,26
3. Open replace with regex search, try this assertion: Find What: "(?<=:..)," and Replace With: "-"

Expected Behavior

Matched character ',' is replaced with the character '-'

Actual Behavior

A match occurs but no actual replacing is done

Debug Information

Notepad++ v7.9 (64-bit)
Build time : Sep 22 2020 - 03:19:04
Path : C:\Program Files\Notepad++\notepad++.exe
Admin mode : OFF
Local Conf mode : OFF
OS Name : Windows 10 Pro (64-bit)
OS Version : 1903
OS Build : 18362.1082
Current ANSI codepage : 1252
Plugins : mimeTools.dll NppConverter.dll NppExport.dll