$ perlbrew switch perl-5.14.2
$ perl -v
This is perl 5, version 14, subversion 2 (v5.14.2) ...
$ perl -Mstrict -Mwarnings -e 'my $re = qr{[ /\\-]}'

$ perlbrew switch perl-5.18.1t
$ perl -v
This is perl 5, version 18, subversion 1 (v5.18.1) ...
$ perl -Mstrict -Mwarnings -e 'my $re = qr{[ /\\-]}'