One way is to use sprintf and hex: 
use warnings;
use strict;

for (qw(00ab 005 5 000 0)) {
    my $nz = sprintf '%x', hex;
    print "$_ ---> $nz\n";
}

__END__

00ab ---> ab
005 ---> 5
5 ---> 5
000 ---> 0
0 ---> 0

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In reply to Re: RegEx to remove leading zeros from a hex number by toolic
in thread RegEx to remove leading zeros from a hex number by Karger78

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