What is the most correct regular expression for a UNIX file path?

Question

What is the most correct regular expression (regex) for a UNIX file path?

For example, to detect something like this:

/usr/lib/libgccpp.so.1.0.2
         


        

Answer 1

^(/)?([^/\0]+(/)?)+$

This will accept every path that is legal in filesystems such as extX, reiserfs.

It discards only the path names containing the NUL or double (or more) slashes. Everything else according to Unix spec should be legal (I'm suprised with this outcome too).