[Question] Extra validation required when extenstion set to NULL

[lenamtl]

Hi,

I found a couple issues with file name, also when extension is set to NULL

'extensions' => null, // null allow any type of file

The code allow file name like this

Case 1: myfilehasnoextension
***Not so sure how to handle this case has when downloading browser add xml extension if any...

Case 2: myfile.txt space and / characters after the dot
I remove space and replacing special characters during the validation

Case 3: myfile'have_apostrophe.txt
I'm replacing apostrophe during the validation

I think even if the extension is set to NULL, it should maybe check if there is a dot and some letter after the dot...