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  1. or download this
    $combined =~ s/[^\x00].*//;
  2. or download this
    ¢¼combined=0c0d060a183672756e33 (”Ļ
”č6run3)
$combined=0a183672756e33 (
”č6run3)
Prefix is "model4r"
  3. or download this
    ...
$combined =~ s/[^\x00].*//s;
...
  4. or download this
    $combined =~ /^(\x00*)/;
my $prefix = substr($first, 0, length($1));
print qq{Prefix is "$prefix"};