Forums Scripts & Popups regex match domain but ignore subdomains

Typing:

//echo -ag $regex(http://www.test.com/ http://test2.com/ http://a.b.c.test3.com/,/([^\/.]+\.(?:com|org|net|ru|sk))(?=\b|\/)/gi) -- $regml(1) -- $regml(2) --- $regml(3)

Will return: 3 -- test.com -- test2.com --- test3.com