I don't understand the "... if the that variable contains an Artist (0 "/"), an Album (1 "/") , A song (2 "/")" part, but here's this: 

c:\@Work\Perl\monks>perl -wMstrict -le
"my @ra = (
   '/Volumes/WD/Not Migrating/Music/Ana Tijoux',
   '/Volumes/WD/Not Migrating/Music/Eminem/Ana Tijoux/Luchin',
   '/Volumes/WD/Not Migrating/Music/Eminem/Ana Tijoux/Luchin/Luchin.m4
+a',
   );
 print qq{'$_'} for @ra;
 ;;
 my $dir_level = qr{ / [^/]+ }xms;
 ;;
 my $n = 4;
 s{ \A (?: $dir_level){$n} / }{}xms for @ra;
 print qq{'$_'} for @ra;
 ;;
 for my $s (@ra) {
   my $n_fs = $s =~ tr{/}{};
   my $indent = '   ';
   printf qq{%s'$s' \n}, $indent x $n_fs;
   }
"
'/Volumes/WD/Not Migrating/Music/Ana Tijoux'
'/Volumes/WD/Not Migrating/Music/Eminem/Ana Tijoux/Luchin'
'/Volumes/WD/Not Migrating/Music/Eminem/Ana Tijoux/Luchin/Luchin.m4a'
'Ana Tijoux'
'Eminem/Ana Tijoux/Luchin'
'Eminem/Ana Tijoux/Luchin/Luchin.m4a'
'Ana Tijoux'
      'Eminem/Ana Tijoux/Luchin'
         'Eminem/Ana Tijoux/Luchin/Luchin.m4a'

[download]

Update: Changed name of regex variable  $dir to more descriptive  $dir_level

Give a man a fish:  <%-{-{-{-<

In reply to Re: Most efficient way to remove some text from a string by AnomalousMonk
in thread Most efficient way to remove some text from a string by adamZ88

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.