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sub byfile {
  my @a = split /(\d+)/, $a;
...
  }
  $res;
}

53 7 119 53red
red5 red6 red7 red67 red6.jpg red12.jpg
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blue2.jpg blue1000.jpg blue2.jpg58

7
53
...
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red12.jpg
red67

 while (defined (my $A = shift @a) and defined (my $B = shift @b)) {
   $res = ($A =~ /\d/) ? $A <=> $B : $A cmp $B;
   return $res if $res;
 }
 return defined $A ? -1 : 1;