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<a href="http://www.AAA.com/" target="_blank">AAAAA</a>
<a href="http://wer.123.com/" target="_blank">BBBBB</a>
<a href="http://adf.h4.456.com/" target="_blank">CCCCC</a>
<a href="http://wer.AAA.com/" target="_blank">DDDDD</a>
<a href="http://asdgwre.wer.222.789.com/" target="_blank">EEEEE</a>
<a href="http://fadsf.543.com/" target="_blank">FFFFF</a>
<a href="http://234r.231.com/" target="_blank">GGGGG</a>
<a href="http://www.AAA.com/" target="_blank">AAAAA</a>
<a href="#" target="_blank">BBBBB</a>
<a href="#" target="_blank">CCCCC</a>
<a href="http://wer.AAA.com/" target="_blank">DDDDD</a>
<a href="#" target="_blank">EEEEE</a>
<a href="#" target="_blank">FFFFF</a>
<a href="#" target="_blank">GGGGG</a>
echo preg_replace_callback("/<a href=\"http\:\/\/[^.]*[^A]+\.com\/\" target=\"_blank\">([^<]+)<\/a>/is",function($r) { return strip_tags($r[0]); },$str);
<a href="http://www.AAA.com/" target="_blank">AAAAA</a>
BBBB
CCCCC
<a href="http://wer.AAA.com/" target="_blank">DDDDD</a>
EEEEE
FFFFF
GGGGG
$str = <<<str
<a href="http://www.AAA.com/" target="_blank">AAAAA</a>
<a href="http://wer.123.com/" target="_blank">BBBBB</a>
<a href="http://adf.h4.456.com/" target="_blank">CCCCC</a>
<a href="http://www.wer.AAA.com/" target="_blank">DDDDD</a>
<a href="http://asdgwre.wer.222.789.com/" target="_blank">EEEEE</a>
<a href="http://fadsf.543.com/" target="_blank">FFFFF</a>
<a href="http://234r.231.com/" target="_blank">GGGGG</a>
str;
echo preg_replace_callback("/http\:\/\/[^.]*[^A]+\.com\//is",function($r) { return str_replace($r[0], "#", $r[0]); },$str);