You could use a look-ahead.

use strict;
use warnings;

my @nos = qw{
   12304500
   123
   1234567000000
   987045027000
};

print
   map { sprintf qq{%15s : %5s\n}, @$_ }
   map { [ $_, m{(\d{1,5})(?=0*\z)} ] }
   @nos;

[download]

Here's the output.

       12304500 : 23045
            123 :   123
  1234567000000 : 34567
   987045027000 : 45027

[download]

I hope this is of use.

Cheers,

JohnGG

Update: No, that doesn't work unless you make the \d{1,5} non-greedy, as suggested by duff

In reply to Re: When greedy constructs do battle, can I choose the winner? by johngg
in thread When greedy constructs do battle, can I choose the winner? by amarquis

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