php正则表达式无法在php中工作[preg_replace}

Question

I am trying to remove the following html but my regex isn't working

<div class="vmargin"><div><iframe src="/test.php?u=N0Bhlant98C6MRj0D44HwJMuf5TdA%2F24oG9hQ2qqX6IR2IruUxVrrhLR4EpHQDvGtuHH4%2BLgJMBG6L5%2BTs6t6FfgCbo%3D&amp;b=5&amp;f=frame" style="width:718px;height:438px;border:0;margin:0;padding:0;" __idm_frm__="100"></iframe></div><div><a href="" class="report_video" data-video-id="732253" title="Report Video">Video Broken?</a></div></div>

I tried the following regex

preg_replace("@<div class=\"vmargin\".*?<\\/div>.*?<\\/div><\\/div>@s",'', $input); 

What's wrong with it

Answer 1

Do not use \\ because in your closing divs, there are no \ character. Try this:

<div class=\"vmargin\".*?<\/div>.*?<\/div><\/div>

So:

$string = '<div class="vmargin"><div><iframe src="/test.php?u=N0Bhlant98C6MRj0D44HwJMuf5TdA%2F24oG9hQ2qqX6IR2IruUxVrrhLR4EpHQDvGtuHH4%2BLgJMBG6L5%2BTs6t6FfgCbo%3D&amp;b=5&amp;f=frame" style="width:718px;height:438px;border:0;margin:0;padding:0;" __idm_frm__="100"></iframe></div><div><a href="" class="report_video" data-video-id="732253" title="Report Video">Video Broken?</a></div></div>';
$input = preg_replace("@<div class=\"vmargin\".*?<\/div>.*?<\/div><\/div>@s", '', $string);
var_dump($input);

Output: string '' (length=0)