Is the ZIP code always at the beginning of the filename? You can use the core module File::Basename to strip off the path:
use warnings;
use strict;
use File::Basename qw/fileparse/;
my @files = ( '-/yf/-/22211_01_09_2000_XYz.pdf',
'_/gt/-/02239_04_04_1989_PkW.pdf',
'-/xy/-/02239_04_04_1989_PkW.pdf' );
for my $file (@files) {
my $bn = fileparse($file);
my ($zip) = $bn =~ /^(\d{5})\D/;
print "$file => $zip\n";
}
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