SiLiK,
The following code should be all you want and a bag of chips too.

#!/usr/bin/perl
use strict;
use warnings;

my @template = (
    '1: date 6', '2: time 4', '3: duration 4', '4: calling-num 15',
    '5: dialed-num 18', '6: code-used 4', '7: cond-code 1',
    '8: ppm 5', '9: auth-code 13',
);
my $string = '21090412500011            209         070279501 9047    
+0         1111';
my %code = Parse_String(\@template, $string);
print "$code{date}\n";
print "$code{'auth-code'}\n";

sub Parse_String {
    my ($rosetta, $string) = @_;
    my $template;
    my @fields;
    for ( @{ $rosetta } ) {
        if ( /^\d+:\s+([^\s]+)\s+(\d+)/ ) {
            push @fields , $1;
            $template .= 'a' . $2;
        }
    }
    my %code;
    @code{ @fields } = unpack $template , $string;
    return %code;
}
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I know I didn't provide you with another array because it appears that a hash would be better. It should be trivial to change it if that's what you truly want.