Here's a regular expression that will do it for that page.
\.\w+(?=</a></li>)
REY
PHP
$content = file_get_contents('http://www.uniteddomains.com/index/footer/');
preg_match_all('/\.\w+(?=<\/a><\/li>)/m', $content, $matches);
print_r($matches);
PHPFiddle
Here are the results:
.africa, .amsterdam, .bcn, .berlin, .boston, .brussels, .budapest, .gent, .hamburg, .koeln, .london, .madrid, .melbourne, .moscow, .miami, .nagoya, .nyc, .okinawa, .osaka, .paris, .quebec, .roma, .ryukyu, .stockholm, .sydney, .tokyo, .vegas, .wien, .yokohama, .africa, .arab, .bayern, .bzh, .cymru, .kiwi, .lat, .scot, .vlaanderen, .wales, .app, .blog, .chat, .cloud, .digital, .email, .mobile, .online, .site, .mls, .secure, .web, .wiki, .associates, .business, .car, .careers, .contractors, .clothing, .design, .equipment, .estate, .gallery, .graphics, .hotel, .immo, .investments, .law, .management, .media, .money, .solutions, .sucks, .taxi, .trade, .archi, .adult, .bio, .center, .city, .club, .cool, .date, .earth, .energy, .family, .free, .green, .live, .lol, .love, .med, .ngo, .news, .phone, .pictures, .radio, .reviews, .rip, .team, .technology, .today, .voting, .buy, .deal, .luxe, .sale, .shop, .shopping, .store, .eus, .gay, .eco, .hiv, .irish, .one, .pics, .porn, .sex, .singles, .vin, .vip, .bar, .pizza, .wine, .bike, .book, .holiday, .horse, .film, .music, .party, .email, .pets, .play, .rocks, .rugby, .ski, .sport, .surf, .tour, .video