Is there a way in laravel to validate file type with capital extension?

I am submitting a form using laravel, in which I am uploading multiple files, the form is working fine and files are also storing but when I have a file with extension in capital "abc.PDF" it gives me a 302 move temporarily error, so i want to know is there any way that can also validate files having extension in capital "PDF, DOC".I searched a lot but not find any solution.

via Chebli Mohamed