Regular expressions can come in handy when you need to find strings. This Regual expression simply matches relative paths. It’s not perfect, but it gets the job done :)

(([^\./\\:*?<>|"]*)(/[^\./\\:*?<>|"]*)*/([^\./\\:*?<>|"]*\.[^\./\\:*?<>|"]+))

I should mention, that this regex is meant for python and also the relative path has to have a file ending. This means that, for example the path ‘path/without/filending’ doesn’t get matched by the regex, but ‘path/with/file.ending’ does.

Update:#

^(\/?[^\/]+)(\/[^\/]+)*\/([^\/]*\.[^\/]+)$

This is the optimized version :) - a lot shorter. Check this site for trying regular expressions.