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my $ip_address = "";
if ( $allclasses_file =~ m/_([^_]+$)/ ) {
...
        }
}
return $ip_address;

my $ip_address = "";
if ( $allclasses_file =~ m/_(\d+\.\d+\.\d+\.\d+)$/) {
    $ip_address = $1;
}
return $ip_address;