It's unclear what you really want. I mean, if you just have this number, and all you need is 12, 34 and 45, you could do:

    my ($var1, $var2, $var3) = (12, 34, 45);
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But what do you want to do in the general case? Always end up with three numbers? Always get a list of 2 digit numbers?

In the former case, I'd use substr:

my $str = 123445;
my $l = int (length ($str) / 3); 
my $var1 = substr $str, 0, $l;
my $var2 = substr $str, $l, $l;
my $var3 = substr $str, 2 * $l;
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In the latter case, a regex will do:

my @vars = $str =~ /..?/g;
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Next time, be more precise in what you want. And having a working example helps too (123345 isn't "12" . "34" . "45").

Abigail