How to get all YouTube iframe from HTML using regex

I want to get all YouTube iframe using regex and want to add specific tag to each record found.

For example <youtube-frame></youtube-frame> to iframe begeing and end.

Needed output:

<youtube-frame><iframe width="560" height="315" src="https://www.youtube.com/embed/vakfMRyjulw" frameborder="0" allowfullscreen></iframe></youtube-frame>

<youtube-frame><iframe width="560" height="315" src="https://www.youtube.com/embed/aDGWMlKPKDs" frameborder="0" allowfullscreen></iframe></youtube-frame>

My Code

$embed = '
<iframe width="560" height="315" src="https://www.youtube.com/embed/vakfMRyjulw" frameborder="0" allowfullscreen></iframe>

<iframe width="600" height="350" src="https://tune.pk/player/embed_player.php?vid=6508414&folderp2016/05/04/&width=600&height=350&autoplay=no" frameborder="0" allowfullscreen scrolling="no"></iframe>

<iframe width="560" height="315" src="https://www.youtube.com/embed/aDGWMlKPKDs" frameborder="0" allowfullscreen></iframe>

<iframe width="600" height="350" src="https://tune.pk/player/embed_player.php?vid=6508414&folder=2016/05/04/&width=600&height=350&autoplay=no" frameborder="0" allowfullscreen scrolling="no"></iframe>

<iframe width="600" height="350" src="https://tune.pk/player/embed_player.php?vid=6508414&folder=2016/05/04/&width=600&height=350&autoplay=no" frameborder="0" allowfullscreen scrolling="no"></iframe>
';

What I have tried?

$pattern = '/<iframe.*src="//youtube".*/';
$iframeSrc = preg_match($pattern, $embed, $matches);
var_dump($iframeSrc);

Answer

Try this:

$iframeSrc = preg_replace('/<iframe[^>]*srcs*=s*"?https?://[^s"/]*youtube.com(?:/[^s"]*)?"?[^>]*>.*?</iframe>/i', '<youtube-frame>$0</youtube-frame>', $embed);

This uses preg_replace and a global regex to replace all YouTube IFrame tags (including their closing tags) with <youtube-frame>$0</youtube-frame> where $0 is the original string.

The regex could theoretically be simplified if you are totally sure about the format of your input, but I designed it to be robust enough to cope with other syntaxes such as src=http://example.com or src = "http://example.com" etc. which are accepted by browsers nowadays, and it only matches sources on *.youtube.com domains and not something like myyoutubesite.com.

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Answer