There are at least three different sensible ways plus a few silly ones.

$str = "1234-56";

# you can split on the '-' - the second bit is what we want.....

my (undef, $digits) = split '-', $str;

# you can use index to get the position in the string of the '-'
# and substr to get the 2 chars just past that position.....

$digits = substr $str, index($str, '-')+1, 2;

# you can use an RE.....

($digits) = $str =~ m/\-(\d\d)/;
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