use strict;
use warnings;

my @strings = (
   '<a href="http://.../1.zip">1</a><a href="http://.../2.zip">2</a>',
   '<a href="http://.../3.zip">3</a><a href="http://.../4.zip">4</a>',
   '<a href="http://.../5.zip">5</a><a href="http://.../6.zip">6</a>',
   '<a href="http://.../7.zip">7</a><a href="http://.../8.zip">8</a>',
   '<a href="http://.../9.zip">9</a><a href="http://.../10.zip">10</a>',
);

foreach my $line (@strings) {
   foreach my $zip ( $line =~ m|href="(http.+?\.zip)"|g ) {
      print $zip, "\n";
   }
}

http://.../1.zip
http://.../2.zip
http://.../3.zip
http://.../4.zip
http://.../5.zip
http://.../6.zip
http://.../7.zip
http://.../8.zip
http://.../9.zip
http://.../10.zip

my $octet   = q/(?: 25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})/;
my $ipaddr  = qr/^$octet\.$octet\.$octet\.$octet\z/x;