poj's idea of changing the words to enable lexicographical sort can be expressed as a variant of the Schwartzian Transform (ST) called the Guttman Rosler Transform (GRT), which is deemed to be faster than the ST because the sort phase is entirely C code and it avoids one level of indirection. The idea of poj expressed with the GRT construct:

use strict;
use warnings; 

my @files =  map {s/-0(\d)(\.gz)$/-$1$2/; $_} 
             sort
             map {s/-(\d)(\.gz)$/-0$1$2/; $_} <DATA>;

print $_ for @files; 

__DATA__ 
abcd1_abc_123456.abc1a_A.201307290800-0900-0.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-1.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-10.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-11.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-2.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-3.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-0.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-1.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-10.gz
abcd1_abc_123456.abc1a_A.201305290800-0900-11.gz
abcd1_abc_123456.abc1a_A.201308290800-0900-2.gz
abcd1_abc_123456.abc1a_A.201302290800-0900-3.gz
abcd1_abc_123456.abc1a_A.201306290800-1000-1.gz
abcd1_abc_123456.abc1a_A.201306290800-1000-10.gz
abcd1_abc_123456.abc1a_A.201305290800-1000-11.gz
abcd1_abc_123456.abc1a_A.201308290800-1000-2.gz
abcd1_abc_123456.abc1a_A.201302290800-1000-3.gz

[download]

The output is as follows:

$ perl schwartz.pl
abcd1_abc_123456.abc1a_A.201302290800-0900-3.gz
abcd1_abc_123456.abc1a_A.201302290800-1000-3.gz
abcd1_abc_123456.abc1a_A.201305290800-0900-11.gz
abcd1_abc_123456.abc1a_A.201305290800-1000-11.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-0.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-1.gz
abcd1_abc_123456.abc1a_A.201306290800-0900-10.gz
abcd1_abc_123456.abc1a_A.201306290800-1000-1.gz
abcd1_abc_123456.abc1a_A.201306290800-1000-10.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-0.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-1.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-2.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-3.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-10.gz
abcd1_abc_123456.abc1a_A.201307290800-0900-11.gz
abcd1_abc_123456.abc1a_A.201308290800-0900-2.gz
abcd1_abc_123456.abc1a_A.201308290800-1000-2.gz

[download]

For more information on the GRT, see e.g. Advanced Sorting - GRT - Guttman Rosler Transform (this is just one I picked up at random, you have several links in this post to other nodes, and there are many other nodes on the subject)

In reply to Re^2: Custom Sort Array by Laurent_R
in thread Custom Sort Array by omegaweaponZ

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