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#!/usr/bin/env perl

use 5.01800;
...
        $case =~ qr{$re} ? "matches: '$&'" : "doesn't match";
    };
__END__

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perl Conway_01.pl
<1>
...
matches! <1,2>
<1,2,<3,4>,5,6>
matches! <3,4>      !!!! shouldn't this be <1,2,<3,4>,5,6>