Preg replace:php Filter Hyperlinks and determine if the text in the link is a URL preg

The sample code is as follows:
$str = ' <a class= "style" href= "http://www.cxybl.com/" target= "_blank" >www.cxybl.com</a> <a href= "http ://www.cxybl.com ">cxybl</a> filter HYPERLINK";
$str = Filter_url ($STR);
The processing code is as follows:
function Filter_url ($STR) {
Return Preg_replace_callback ("/<a[^>]+> (. +?)" <\/a>/i "," Filter_url_callback ", $str);
}
function Filter_url_callback ($matchs) {
$STR = $matchs [1];
if (! $str) return ";
$arr = Array (' www. ', ' http://', '. com ', '. cn ', '. org ', '. Net ', '. CC ');
foreach ($arr as $k => $v) {
if (Stripos ($str, $v)!==false) return ";
}
return $str;
}
If the hyperlink text is a www.cxybl.com URL, it will also be filtered out. But if it's plain text, keep it.

This article links http://www.cxybl.com/html/wlbc/Php/20130602/38225.html