Please disregard. I misread the OPs question. This code does the opposite. 
my $file = 'c:\folder1\filename.doc';

$file =~ s{         # Substitue...
            \\          # a backslash
            [^\\]*      # zero or more not-backslashes
            $           # at the end of string
          }
          {}x;      # with nothing
                    #     allow comments & spaces in search-pattern

print $file; # c:\folder1

[download]

Unless I state otherwise, all my code runs with strict and warnings

In reply to Re: Get last occurence of a character in a string by FunkyMonk
in thread Get last occurence of a character in a string by theroninwins

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