A slight variant that unpacks in the right order and drops the reverse for the expense of a second unpack inside a map.

$ perl -Mstrict -Mwarnings -E '
my $out;
$out .= $_ for map { unpack q{xA7}, $_ } unpack q{(B8)*}, q{4B3A};
say $out;'
0110100100001001100111000001
$

[download]

Not as succinct but possibly slightly easier to work out what is going on because it is not immediately clear that your b7 format will drop the last (most significant) bit before you reverse the bits into the correct order.

Cheers,

JohnGG

In reply to Re^2: Convert ASCII string to 7-bit binary string by johngg
in thread Convert ASCII string to 7-bit binary string by Pascal666

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