var_dump($string)
string(125) "<div style="position: relative"><a href="/lists/m_act%5Bcountry%5D/1/">США</a></div>"
<div style="position: relative"><a href="/lists/m_act%5Bcountry%5D/1/"></a></div>
$regOne='/<div (.*)="(.*)"><a href="(.*)/\d/">/';
$repl="";
var_dump(preg_split($regOne,$repl,(string)$string));
array preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )