Re^3: Splitting into variables columned data without delimiters with a regexp ?

I was thinking about solutions with sprintf or split too

split also invokes the regex engine, and doesn't really lend itself to the task, so it's not going to help any.

I've no idea how sprintf could be used for this as its primary purpose is composing strings, not decomposing them.

The regex engine can decompose fix field data surprisingly efficiently, but it will never beat unpack that was designed for this express purpose:

cmpthese -1,{
    a => q[ my $s='x'x1100; my@bits= unpack'(A6A5)*',$s;   ],
    b => q[ my $s='x'x1100; my@bits= $s=~m[(.{6})(.{5})]g; ],
};;
    Rate   b   a
b 4516/s  -- -6%
a 4780/s  6%  --
[download]

Not huge savings but they grow with size:

cmpthese -1,{
    a => q[ my $s='x'x11000; my@bits= unpack'(A6A5)*',$s;   ],
    b => q[ my $s='x'x11000; my@bits= $s=~m[(.{6})(.{5})]g; ],
};;
   Rate    b    a
b 427/s   -- -10%
a 471/s  11%   --
[download]

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