/$my_regex \n \z/xms

##</code><code>##

my $str = "123dog\n";
say "-->$str<--";

--output:--
-->123dog
<--


##</code><code>##

printf "%vd", $my_str; 

--output:--
49.50.51.100.111.103.10    

#6 ascii chars in '123dog', but outputs 7 codes.
#Checking an ascii chart for the code 10:
#line feed.  Ah hah, I forgot to chomp()
#the string!