Hello haukex,

Sorry for the late reply, but I was for a few days not able to work on that one.

I've followed your advice, opened the file in raw mode. Before, I was using the module use Path::Tiny; and then path('<file.pdf>')->slurp_raw; to open the file in raw mode. I guess that's the same behaviour?

Anyway, I followed your advice and came up with the following test program: 

use v5.010;
use strict;
use warnings;

# Reading in file in raw format.
local $/;
open F, "<:raw", "input.pdf" or die $!;
my $raw_content = <F>;

my $nr_of_cos_objects = 10;
my @counter = (1..$nr_of_cos_objects);
my $position = 0;

for my $number (@counter) {
    my $result = $raw_content=~qr/^${number} 0 obj/aa;
    if ($result) {
        say "Object item [$number] ('${number} 0 obj') starts at posit
+ion  [$-[0]]";
    } else {
        say "Object item [$number] ('${number} 0 obj') start position 
+not found";
    }

    if ($result) {
        say "Object item [$number] ('${number} 0 obj') ends   at posit
+ion  [$+[0]]\n";
    } else {
        say "Object item [$number] ('${number} 0 obj') end   position 
+not found\n";
    }
}

say "End test program.  Bye...";

[download]
Result: nothing is found at all when using /aa (or /a). This is the output: 
Object item [1] ('1 0 obj') start position not found
Object item [1] ('1 0 obj') end   position not found

Object item [2] ('2 0 obj') start position not found
Object item [2] ('2 0 obj') end   position not found

Object item [3] ('3 0 obj') start position not found
Object item [3] ('3 0 obj') end   position not found

Object item [4] ('4 0 obj') start position not found
Object item [4] ('4 0 obj') end   position not found

Object item [5] ('5 0 obj') start position not found
Object item [5] ('5 0 obj') end   position not found

Object item [6] ('6 0 obj') start position not found
Object item [6] ('6 0 obj') end   position not found

Object item [7] ('7 0 obj') start position not found
Object item [7] ('7 0 obj') end   position not found

Object item [8] ('8 0 obj') start position not found
Object item [8] ('8 0 obj') end   position not found

Object item [9] ('9 0 obj') start position not found
Object item [9] ('9 0 obj') end   position not found

Object item [10] ('10 0 obj') start position not found
Object item [10] ('10 0 obj') end   position not found

[download]

The /m is apparently indispensable in this regex setup, so I also tried /ma and /maa combinations. When doing this, I get the results back, but incorrect (same results as my very initial attempts...). 

Object item [1] ('1 0 obj') starts at position  [19]
Object item [1] ('1 0 obj') ends   at position  [26]

Object item [2] ('2 0 obj') starts at position  [235]
Object item [2] ('2 0 obj') ends   at position  [242]

Object item [3] ('3 0 obj') starts at position  [344]
Object item [3] ('3 0 obj') ends   at position  [351]

Object item [4] ('4 0 obj') starts at position  [667]
Object item [4] ('4 0 obj') ends   at position  [674]

Object item [5] ('5 0 obj') starts at position  [2663]
Object item [5] ('5 0 obj') ends   at position  [2670]

Object item [6] ('6 0 obj') starts at position  [3139]
Object item [6] ('6 0 obj') ends   at position  [3146]

Object item [7] ('7 0 obj') starts at position  [3514]
Object item [7] ('7 0 obj') ends   at position  [3521]

Object item [8] ('8 0 obj') starts at position  [3839]
Object item [8] ('8 0 obj') ends   at position  [3846]

Object item [9] ('9 0 obj') starts at position  [5063]
Object item [9] ('9 0 obj') ends   at position  [5070]

Object item [10] ('10 0 obj') starts at position  [5501]
Object item [10] ('10 0 obj') ends   at position  [5509]

[download]

Best rgds,
Geert

In reply to Re^2: Calculated position incorrect when using regex in text file that also contains binary info (updated) by geertvc
in thread Calculated position incorrect when using regex in text file that also contains binary info by geertvc

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