This topic was covered just yesterday as a snippet. Try it this way:

use constant MIN_CHAR => 1;   # no need to put a 'scalar' in front
use constant MAX_CHAR => 12;

print "x ${\MIN_CHAR}-${\MAX_CHAR}";
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   MeowChow                                   
               s aamecha.s a..a\u$&owag.print