use strict;
use warnings;

use Data::Dumper;
use List::Util qw{ min max };

open my $textFH, q{<}, \ <<'END_OF_FILE' or die qq{open: $!\n};
hi:  65 abcdefghijklmnopqrst 85
bye: 12 bcdefghijklmnopqrstu 32

hi:  86 sagfsdgsgwsehbbdgops 106
bye: 33 afasdfdfafasaafadfad 53

END_OF_FILE

my %dataItems = ();

while ( <$textFH> )
{
    next unless m{^(hi|bye):\s+(\d+)\D+(\d+)};
    push @{ $dataItems{ $1 }->{ from } }, $2;
    push @{ $dataItems{ $1 }->{ to } }, $3;
}

close $textFH or die qq{close: $!\n};

print Data::Dumper->Dumpxs( [ \ %dataItems], [ q{*dataItems} ] );

my $hiFrom  = min( @{ $dataItems{ hi }->{ from } } );
my $hiTo    = max( @{ $dataItems{ hi }->{ to } } );
my $byeFrom = min( @{ $dataItems{ bye }->{ from } } );
my $byeTo   = max( @{ $dataItems{ bye }->{ to } } );

print
   qq{\$hiFrom = $hiFrom and \$hiTo = $hiTo\n},
   qq{\$byeFrom = $byeFrom and \$byeTo = $byeTo\n};