Bug in RenameController.php

[domialex]

On line 47 of RenameController.php it seems that there is a regex check using lfm.alphanumeric_directory instead of lfmalphanumeric_filename. The logic here might need some rethinking.
Also, the regex should be '/[^\w.-]/i' or else it will never be able to be renamed using the dot added to the filename on line 36.

[youchenlee]

@domialex Thank you.

That is definitely a bug, and it needs a refactoring.
I'll work on it soon.