Stripping filepath from string

Hi list, I know I have seen this somewhere - but I can't find it (and for some reason I can't get my head around it). Is there a predefined function or alternatively an easy way to strip the filepath of a string containing both filepath and filename? Strings could look like this: /my/file/path/myfile /my/file/path/myfile.name c:\my\file\path\myfile c:\my\file\path\myfile.name etc... I know this should be fairly simple, but my mind is blank (if there's no predefined function I know I should probably use some regex, but me and regex don't get along (I always mess up)). Any help will be greatly appreciated :-) /Christian