Created by: yms9654
When I upload a file, there is a issue if filename hava a unicode letters.(ex: korean or japanese or chinese characters).
It can't pass file_path_regex.
[a-zA-Z0-9_\-\.\/]
So how about this?
[\p{L}\p{N}_\-\.\/]
\p{L} means unicode letter and \p{N} is number.
http://ruby-doc.org/core-2.1.7/Regexp.html#class-Regexp-label-Character+Properties
