You have copied the NAME value to a variable and used as $NAME.
i have specified a method, which will use the constant NAME itself in the regular expression
use strict;

use constant NAME => 'abc';

if ($ARGV[0] =~ /${\NAME}/) { print "match"; };

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In reply to Re^4: using constants in regex/search by spmlingam
in thread using constants in regex/search by geniezlife

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