Modifying environment values by rules

[WltrMrks4S]

Feature Request

Problem statement.
I have an issue when using environment variables for extending them with additional values to a new environment variable used by the application to start. Windows environment variables consisting backward slashes as path separator. But some applications can not use backward slashes as path separator. So there must be a possibility to replace these characters by other ones.

E.g. %ProgramData%/OtherDirectory expands to C:\ProgramData/OtherDirectory but the application (e.g. rotatelogs.exe of Apache HTTPD) only can handle forward slashes as path separator.

Describe the solution you'd like.
The solution could be to use rules for modifying expanded variables.
Preferably regular expression could be used for that.