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$ perl -Mstrict -Mwarnings -E '
    my $re_2_5 = qr{^@{[join "|", 2 .. 5]}$};
...
6 in 6-10 range
7 in 6-10 range
11 not in range

Select or download this

$ perl -Mstrict -Mwarnings -E '
    my $re_2_5 = qr{^@{[join "|", 2 .. 5]}$};
...
6 in 6-10 range
7 in 6-10 range
11 not in range