That regexp isn't going to work. Running it against a string of 10 identical numbers, it will match those 10 numbers.

my $str = '0000000000';
my @matched = $str =~ /
    [^\d]*
    (?:\b(?: 0{10,} | 1{10,} | 2{10,} | 3{10,} | 4{10,} | 5{10,} |
             6{10,} | 7{10,} | 8{10,} | 9{10,})\b [^\d]*
    )*
    (\b\d{10,}\b)
    (?:[^\d]* \b(?: 0{10,} | 1{10,} | 2{10,} | 3{10,} | 4{10,} | 5{10,
+} |
                    6{10,} | 7{10,} | 8{10,} | 9{10,})\b
    )*
    /gx;
say "@matched";
__END__
0000000000
[download]

The problem with your regexp is is that skipping sequences of 10 identical digits is optional. And that the heart, the (\b\d{10,}\b) part, isn't restrictive. And that Perl will do its utter best to find a match somehow, somewhere.