For long input strings, the following should be faster than the previously submitted solutions: 

my $out = unpack('B*', $str) =~ s/.(.{7})/$1/sgr;     # 5.14+

( my $out = unpack('B*', $str) ) =~ s/.(.{7})/$1/sg;  # 5.6+

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

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