G'day catemp,

Welcome to the Monastery.

After looking through the thread, I couldn't see any specifics about how you wanted the output ordered. Here's three solutions with different output orders; they become progressively more complicated and, accordingly, will take longer to run.

I started with the data you posted below. I then added a few more lines for test purposes: 

6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8

[download]

appears three times: two adjacent; one separated. 

6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788

[download]

is a new substring of others starting with 6Y0248 but is separated from them; it's the new first record.

Here's the code containing all three solutions: 

#!/usr/bin/env perl

use strict;
use warnings;

my @in_data = qw{
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
2N0472|6N8595|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
3419308|3514531|3525716|3557019|3586192|3635776|3783741
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721
3T3628|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152
};

print "Input data:\n", '-' x 40, "\n";
print "$_\n" for @in_data;

{
    my @out_data;

    print '-' x 40, "\nOutput data (unordered):\n", '-' x 40, "\n";

    my $long_string;

    for my $string (reverse sort @in_data) {
        if (defined $long_string) {
            next if index($long_string, $string) == 0;
        }

        $long_string = $string;
        print "$string\n";
    }
}

{
    my @out_data;

    print '-' x 40, "\nOutput data (ordered by first field):\n", '-' x
+ 40, "\n";

    my $long_string;

    for my $string (reverse sort @in_data) {
        if (defined $long_string) {
            next if index($long_string, $string) == 0;
        }

        $long_string = $string;
        push @out_data, $string;
    }

    print "$_\n" for sort @out_data;
}

{
    my @out_data;

    print '-' x 40, "\nOutput data (original order):\n", '-' x 40, "\n
+";

    my $long_string;
    my $pos = 0;

    for my $pos_string (sort { $b->[1] cmp $a->[1] } map [ $pos++, $_ 
+], @in_data) {
        if (defined $long_string) {
            next if index($long_string, $pos_string->[1]) == 0;
        }

        $long_string = $pos_string->[1];
        push @out_data, $pos_string;
    }

    print "$_->[1]\n" for sort { $a->[0] <=> $b->[0] } @out_data;
}

print '-' x 40, "\n";

[download]

Note the use of anonymous blocks to limit the scope of identically named variables (e.g. @out_data and $long_string).

Here's the output: 

Input data:
----------------------------------------
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
2N0472|6N8595|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
3419308|3514531|3525716|3557019|3586192|3635776|3783741
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721
3T3628|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152
----------------------------------------
Output data (unordered):
----------------------------------------
R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
3T3628|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721
3419308|3514531|3525716|3557019|3586192|3635776|3783741
2N0472|6N8595|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
----------------------------------------
Output data (ordered by first field):
----------------------------------------
2N0472|6N8595|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
3419308|3514531|3525716|3557019|3586192|3635776|3783741
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721
3T3628|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
----------------------------------------
Output data (original order):
----------------------------------------
2N0472|6N8595|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
3419308|3514531|3525716|3557019|3586192|3635776|3783741
3T3625|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721
3T3628|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
4N4906|6N6481|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788
6N7936|6N5049|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8
R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|2757803
6Y0248|6T7765|9L1366|1189902|1413983|8B2026|1M3381|7K3377|3H5788|1F785
+4|8W1152|8R0721|9C5344|6W6672|9G7101|3023908|6Y1352|4P0489|1336934
----------------------------------------

[download]

— Ken

In reply to Re: Best method to eliminate substrings from array by kcott
in thread Best method to eliminate substrings from array by catemp

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