如何删除邮件格式容器标记以外的标记

Question

用文字描述我的问题很困难,我会试着给出一个例子:

str = '<p>lorem ipsum <xyz@abc.com> donor sit <br></p>';

我需要删除所有标签,除了 <xyz@abc.com>

我们怎样才能在javascript和PHP中做到？

我的PHP解决方案:

class test {
    public function keepMailAddresses($text){
       $callBack = array($this,'_keepMailAddresses');
       return preg_replace_callback('/(<)([^0-9][a-zA-Z0-9_]*([.][a-zA-Z0-9_]+)*[@][a-zA-Z0-9_]+([.][a-zA-Z0-9_]+)*[.][a-zA-Z]{2,4})(>)/i', $callBack, $text);        
    }

    private function _keepMailAddresses($matches){
       return '&lt;'.$matches[2].'&gt;';
    }

}

$obj = new test();
echo $obj->keepMailAddresses('<p>lorem ipsum <xyz@abc.com> donor sit <br></p>');

Answer 1

好吧，我的解决方案有点奇怪，但可以解决问题：D

$pagecode = '<p>lorem ipsum <xyz@abc.com> donor <abc_def.xyz@abc.com> sit <abc_def.xyz@abc.abc.com><br></p>';

// this will check if it's a real email but you don't need it
/*$allowed = preg_match_all("/\<+([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})+\>/i", $pagecode, $matches);*/

$allowed = preg_match_all("/\<([_a-z0-9-\.]+)@([_a-z0-9-\.]+)\>/i", $pagecode, $matches);

$allowed = implode(" ", $matches[0]);
$output = strip_tags($pagecode, $allowed);
echo htmlentities($output);