Using bitwise operators won't work because te masked bytes will be null; which are still characters.
Faster that split would be to use unpack:
#! perl -slw
use strict;
print unpack 'x3a7x2a4x2a7', $_ while <DATA>;
__DATA__
0121012102??????????12121212????????
0111011102??????????12111112????????
0111011102??????????12111112????????
Produces:
C:\test>junk55
1012102??????12121
1011102??????12111
1011102??????12111
Possibly faster still would be to set up an array of substr refs into a single buffer:
#! perl -slw
use strict;
my $buf = chr(0) x 400_000;
my @refs = map {
\substr $buf, $_->[0], $_->[1]
} [3,7],[12,4],[18,7];
while( <DATA> ) {
substr( $buf, 0 ) = $_;
print map $$_, @refs;
}
__DATA__
0121012102??????????12121212????????
0111011102??????????12111112????????
0111011102??????????12111112????????
Produces:
C:\test>junk55
1012102??????12121
1011102??????12111
1011102??????12111
You'll have to benchmark to see if whether the latter which was once faster on some earlier version of perl still is on yours.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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