As prasadbabu given correct answer I believe.
As of my understand you want the last potion from the line which begins with Note. I also done this with split function.
use strict;
use warnings;
my $x;
while($x=<DATA>){
chomp($x);
if ($x =~ /^\[Note\]/){
my $find=(split(/\,/,$x))[-1] ;
print "$find\n";
+
+
}
}
__DATA__
[Note]note_values,notes_values2
[Book]novels,magazines
[Note]note_values,notes_values56
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