If you're matching against some $string, \z matches the end of the string.
my $field = '*E2@x*PAP';
$field =~ /\*PAP\z/;
You can also use $, which will match at the end of the string with or without a newline.
my $nl = "newline\n";
my $nonl = "newline";
$nl =~ /line$/;
$nonl =~ /line$/;
Update: As Test::More:
use Test::More 'tests' => 3;
my $field = '*E2@x*PAP';
ok( $field =~ /\*PAP\z/, '\\z matches at end of string' );
my $nl = "newline\n";
my $nonl = "newline";
ok( $nl =~ /line$/, '$ matches newline at end' );
ok( $nonl =~ /line$/, '$ matches end of string without newline' );
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