assuming you want to sort by category/title/number
#!/usr/bin/perl -w
use strict;
my @array = qw (biology_humananatomy_2 math_riemannhypothesis_1 biolog
+y_humananatomy_1 );
my @AoA;
for (@array) {
push(@AoA,[split /\_/,$_,3]);
}
my @final = sort {$a->[0] cmp $b->[0] ||
$a->[1] cmp $b->[1] ||
$a->[2] <=> $b->[2]} @AoA;
for (@final) {
print join('_',@$_),$/;
}
output:
biology_humananatomy_1
biology_humananatomy_2
math_riemannhypothesis_1
Please read other posts to understand why your code does not work.
cheers
SK
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