As part of a project I'm working on, I need to play with a path-like data structure. It comes in the form '/foo/bar/baz'. I need to check the full path, then '/foo/bar', then '/foo' and finally '/'.

So I've put together a do {} while loop that terminates when the path variable is length 0. I'm using a regex to trim the path: 

do
{   if (exists $o->{$path})
    {   # Do stuff
    }
    # trim path
    print "\t\t$path\n";
    $path =~ s:(^/$)|((?<=^/)[^/]+$)|(/[^/]+$)::x;

} while ( length $path > 0 );

[download]

I keep futzing with the regex and can't come up with something that works. I keep failing to get '/' processed.

Once again, here's the transformation I'm looking for: 

 '/foo/bar'-> '/foo'
 '/foo' ----> '/'
 '/' -------> ''


TGI says moo

In reply to Trimming Paths with regexes by TGI

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