How can I check that a link is automatically added to an article? -Php Tutorial

How can I check that a link is automatically added to an article? I think it is impossible to use the existing resources on the Internet and the difficult points... that is, the content may also need to filter the image and video URL (iframe)

I used the following sections for automatic detection.

But the problem is that sometimes the image

The video is displayed in iframe mode.

So I would like to ask how I can take an Image () film () Filter such items (skip and ignore) </strong> <br/> The $ content obtained is already HTML code. <br/> <pre class = "sycode" name =" code "> $ content = preg_replace_callback ('#(? : Https? : // \ S +) | (? : Www. \ S +) | (? : \ S + \. \ S +) # ', function ($ arr) {if (strpos ($ arr [0], 'http ://')! = 0) {$ arr [0] = 'http ://'. $ arr [0] ;}$ url = parse_url ($ arr [0]); // links return sprintf ('% 1 $ s ', $ arr [0]) ;}, $ content); </pre> <p> </p> <br/> reply to the discussion (solution) <p class = "sougouAnswer">? Exam: http://blog.baiwand.com /? Post = 150 </p> <p class = "sougouAnswer"> <p class = "yy"> Reference: http://blog.baiwand.com /? Post = 150 </p> Thanks <br/> for learning the key points <br/> Originally, we had to mark the key and then process it.