What you are seeing, are the effects of overload for Regexp objects. You can use == to compare

use strict;
use warnings;

my $re =qr{a};
my $re2 =qr{a};
warn $re == $re2;
warn $re2 == $re2;
warn 0+$re;
warn 0+$re2;
__END__
Warning: something's wrong at - line 8.
1 at - line 9.
2252896 at - line 10.
2252956 at - line 11.
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Regexp objects are a special case (isn't everthing), you can call methods on them, but you can't dereference them