It's not clear whether your "...and so on" means that you want to grab several pieces of information from each filename or whether you just mean more filenames with one thing to grab each time.

To take the case that the others have not answered so far, let's assume for a moment that the number of digits is always exactly the same each time and that you want to retrieve several bits of data from the filename. Try a regex. Long form:

use strict;

my ($this, $that, $tother, $twix);
my $fname = "0092042095432.dat";

if ($fname =~ /^(\d{4})(\d{3})(\d{3})(\d{3})/) {
   ($this, $that, $tother, $twix) = ($1,$2,$3,$4);
}
print "$this $that $tother $twix\n";   # ...or whatever
[download]

Or... more succinctly and idiomatically:

($this, $that, $tother, $twix) 
      = $fname =~ /^(\d{4})(\d{3})(\d{3})(\d{3})/;
print "$this $that $tother $twix\n";   # ...or whatever
[download]

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