Placeholer if image not found and two different src directories

[c4sti3l]

Is it possible to set a placeholder, if the image is not found?

My configuration works:
'src_dir' => storage_path().'/uploads',
'crops_dir' => storage_path().'/uploads/thumbs',
'path' => 'uploads/(?:thumbs/)?(.*)$',

But if I want to switch my config to something like:
'src_dir' => storage_path().'/images/uploads',
'crops_dir' => storage_path().'/uploads/thumbs',
'path' => '^uploads/(?:thumbs/)?(.*)$',

Then I don't find any image.