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The documentation for tr clearly states that it does not interpolate. As a workaround, we can interpolate into a string and then evaluate that string. The first two tests below demonstrate that we build the expected string and that it evaluates correctly. As a notational convenience, we can combine these two steps into one statement. The third test below demonstrates that form.
use strict; use warnings; use Test::Simple tests=>3; my $kards; my $bad = 'AKQJT98765432KKKK'; my $card = 'K'; my $string = "\$bad =~ tr/$card//"; ok($string eq '$bad =~ tr/K//', "string = '$string'"); $kards = eval $string; ok($kards == 5, "Number of K's in $bad is $kards"); $kards = eval "\$bad =~ tr/$card//"; ok($kards == 5, "Combined form");

OUTPUT:

1..3 ok 1 - string = '$bad =~ tr/K//' ok 2 - Number of K's in AKQJT98765432KKKK is 5 ok 3 - Combined form
Bill

In reply to Re: tr operator in eval -- updated by BillKSmith
in thread tr operator in eval -- updated by pgmer6809

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