Fixed NodeProcessor relative path validation

This PR fixes the regex for validating PATH properties to allow more than one `../` section.
this is an extremely limited kind of path. i am actually surprised that this worked at all. a path may contain dots and lots of other characters. this expression seems to restrict paths way more than the transport does, and the `..` is is just weird, as .. would have to be followed by at least one character. then the whole thing can be repeated. 

i do think we need to fix this but this change is not fixing much as it would allow `....a` for example which makes no sense. this should basically allow every path one can have.