Regex PHP - Auto-detect YouTube, image and "regular" links

Question

I want to make it so that in my chat-application, links to websites can be clickable and links to YouTube and images automatically gets embedded.

I've made this code in Java for my WebIRC client but now I'm trying to make it in PHP and JavaScript.

I'm not familiar with PHP yet so I don't know that much about using regex there. I wonder if some kind soul could help me with this...

For the YouTube-thingy I tried this without success:

if (preg_match("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v\/)[^&\n]+|(?<=v=)[^&\n]+|(?<=youtu.be/)[^&\n]+#", $message, $m)) {
    $video_id = $m[1];
    $message = preg_replace("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v\/)[^&\n]+|(?<=v=)[^&\n]+|(?<=youtu.be/)[^&\n]+#","<iframe class='embedded-video' src='http://www.youtube.com/embed/" . $video_id . "' allowfullscreen></iframe>",$message);
}

URLs ending with .jpg || .gif || .png sohuld be embedded images. youtube videos (youtube.com/watch?v=XnWyrdBX08w&feature=feedu) should extract to video id (in this case XnWyrdBX08w) and put it like described above in an iframe. All other URLs should be clickable links (<a href=""></a>) — Jeremy Karlsson
– Jeremy Karlsson, Commented Nov 6, 2011 at 12:45

user142162 · Accepted Answer · 2011-11-06 13:04:13Z

14

Here is a solution I came up with:

$str = 'This is an image: google.ca/images/srpr/logo3w.png

YouTube: http://www.youtube.com/watch?v=V2b8ilapFrI&feature=related

Stackoverflow:  http://stackoverflow.com/';

$str = preg_replace_callback('#(?:https?://\S+)|(?:www.\S+)|(?:\S+\.\S+)#', function($arr)
{
    if(strpos($arr[0], 'http://') !== 0)
    {
        $arr[0] = 'http://' . $arr[0];
    }
    $url = parse_url($arr[0]);

    // images
    if(preg_match('#\.(png|jpg|gif)$#', $url['path']))
    {
        return '<img src="'. $arr[0] . '" />';
    }
    // youtube
    if(in_array($url['host'], array('www.youtube.com', 'youtube.com'))
      && $url['path'] == '/watch'
      && isset($url['query']))
    {
        parse_str($url['query'], $query);
        return sprintf('<iframe class="embedded-video" src="http://www.youtube.com/embed/%s" allowfullscreen></iframe>', $query['v']);
    }
    //links
    return sprintf('<a href="%1$s">%1$s</a>', $arr[0]);
}, $str);

Let me know if you need me to clarify anything for you.

answered Nov 6, 2011 at 13:04

user142162

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1 Comment

Rudie Over a year ago

Nice =) Gotta love regex callbacks.

Kal · Accepted Answer · 2013-12-09 02:51:04Z

2

I had some issues with the preg_replace_callback when the text included three dots .... The above code recognized the three dots as a URL which is not true.

Here is my fix and it seems to work at the moment $str = preg_replace_callback('#(?:https?://\S+)|(?:www.\S+)|(?:jpe?g|png|gif)#', function($arr)

Would this fix fail in other cases???

answered Dec 9, 2013 at 2:51

Kal

98818 silver badges30 bronze badges

Comments

AnhTN · Accepted Answer · 2016-10-23 02:16:21Z

0

The code of Tim Cooper doesn't working with https link. Ex: https://www.facebook.com/ It will return http://https://www.facebook.com/

Replace

if(strpos($arr[0], 'http://') !== 0)

by

if(strpos($arr[0], 'http') !== 0)

answered Oct 23, 2016 at 2:16

AnhTN

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