Sub-string filtering

[wernight]

Change case is applied to the entire matching expression.
Some renaming also.

Especially with path renaming, you'd want to apply renaming only to a selected part of the path. Could be used also to rename only certain files.

Via RegEx with look ahead and look behind it's possible, however the current implementation of look behind doesn't support variable with. For example this doesn't work:

(?<=\\STARTING_POINT\\.*)[^\\]+