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Re: Sort an array which contains date formatted elements

by cdarke (Prior)
on Jul 17, 2007 at 13:26 UTC ( #627019=note: print w/replies, xml ) Need Help??

in reply to Sort an array which contains date formatted elements

Alternatively use a custom sort. It is a little more complicated than normal because of the date format. For example:
use strict; my @files = qw (webadmin_jul_10_2007.log webadmin_jul_11_2007.log webadmin_jul_12_2007.log webadmin_jul_13_2007.log webadmin_jul_14_2007.log webadmin_jul_7_2007.log webadmin_jul_8_2007.log webadmin_jul_9_2007.log); sub bydate { # Extract non-numeric and date # Assumes text after date is the same my ($afront, $aday, $ayear) = $a =~ /^([[:alpha:]_]+)(\d+)_(\d+)/; my ($bfront, $bday, $byear) = $b =~ /^([[:alpha:]_]+)(\d+)_(\d+)/; my $retn = ($afront cmp $bfront); $retn = ($ayear <=> $byear) if $retn == 0; $retn = ($aday <=> $bday) if $retn == 0; return $retn } my @sorted = sort bydate @files; local $" = "\n"; print "@sorted\n";

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