Hi ,

my $filenm = "urpmi-parallel-ssh-4.0-20.1mdk.noarch.rpm";

if ($filenm =~ m/((\w+)-)+/){
     
     ($arr,undef,$var70,undef,$var97) =
     split (/((?<=[a-z])\.(?=[a-z]))/,$');
     local $str57 = $&;
     $str57 =~ s/-$//;
     print "[$str57]\n";
     print "[$arr]\n";
     print "[$var70]\n";
     print "[$var97]\n";
}
__END__

[urpmi-parallel-ssh]
[4.0-20.lmdk]
[noarch]
[rpm]
[download]

This solution is through extended pattern of regular expressions . This is , I guess what you may looking for as a regular expression matching and having the answer .