Exclude Folders – preg_match() unknown modifier

Perhaps I’m doing it wrong, or maybe it’s a bug.

I can’t get any folders to be excluded.

No matter what input I try, I get:

Warning: preg_match(): Unknown modifier ‘/’ in /site_root/public_html/wp-content/plugins/organize-media-library/lib/class-organizemedialibrary.php on line 200

I’ve tried the following for a folder called “avatar-cache” located in /wp-content/uploads/avatar-cache:

/avatar-cache
\/avatar-cache
[/avatar-cache]
[\/avatar-cache]
~/avatar-cache~
~\/avatar-cache~

The modifier that is reported as unknown changes based on my input, but the error and line number remain consistent.

I do notice after hitting “Make Folder & Save Changes”, the “\” character is always stripped from my last input.

When I submit:

\/avatar-cache

The admin page reloads with the preg_match warning, and the exclude value shown is always (“\” stripped):

/avatar-cache

That most certainly seems to be the issue.

I’ll try disabling my plugins and the usual routine, but I can’t think of any right now that affect admin form inputs….let alone stripping values from admin form inputs. I’ll check back and perhaps you have some ideas as well.