I am not clear with your inputs because in your previous node you gave [Note] in same line and now in two lines. Any how the below code will work for your above input. It will also match note_values if more than one present in a single line.
use strict;
use warnings;
my $prev = 0;
my $total = 0;
while(my $x = <DATA>){
$prev = 1 if ($x =~ /^\[Note\]$/);
my $count = 0;
if (($x =~ /note_values/) && $prev){
$count = $x =~ s/(note_values)/$1/g; #if more than one note_va
+lues present in a line
$prev = 0;
}
$total = $total + $count;
}
print "Number of occurence: $total";