perl - perl - convert string of numeric values/ranges to actual values

Question

I'd like to convert a sting of the form 1,2,25-27,4,8,14,7-10 into a list of the actual values: 1,2,4,7,8,9,10,14,25,26,27.

I've searched and found nothing that does this sort of expansion. Anyone aware of way to do this easily?

Answer 1

my $s = "1,2,25-27,4,8,14,7-10";
my %seen;
my @arr =
  sort { $a <=> $b }
  grep { !$seen{$_}++ }
  map { 
    my @r = split /-/; 
    @r>1 ? ($r[0] .. $r[1]) : @r;
  }
  split /,/, $s;

print "@arr\n";

输出

1 2 4 7 8 9 10 14 25 26 27

Answer 2

另一种快速完成此操作的方法是使用eval的字符串版本。但是您必须记住，使用 eval 有一些安全隐患，因此您最好在将任何字符串传递给 eval 之前对其进行清理。

use strict;
use warnings;

my $string = "1,2,25-27,4,8,14,7-10";

$string =~ s/-/../g;

my @list = sort {$a <=> $b} keys { map {$_, 1} eval $string };

print "@list\n";  

#output
1 2 4 7 8 9 10 14 25 26 27