Get URL from shortcode tag

Question

I am running a wordpress site and I need the correct regex syntax to get a URL from some shortcode that is returned inside the_content().

When I use the_content(), it will return something like this:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam nulla enim, euismod ut pharetra nec, commodo a augue. Etiam sit amet nibh mauris, eu ornare purus. Vestibulum sed sem enim, sit amet congue leo. 

[video mp4=<<insert video url here>> poster=<<insert imgae placeholder url>>]

How can I get just the video mp4 URL?

Answer 1

There's no need to use regex for this. WordPress has a Shortcode API to do this work for you.

That codex page includes one of my favorite codex code snippets:

function bartag_func( $atts ) {
    extract( shortcode_atts( array(
        'foo' => 'something',
        'bar' => 'something else',
    ), $atts ) );

    ...

Right at the start of the function registering the shortcode it does the following:

• take the user-submitted shortcodes and fill them in with defaults if they aren't provided
• takes the $atts argument and turn each valued into a variable (e.g. $foo, $bar, etc.)
  • For you, you'd get $mp4 and $poster

Answer 2

You can use substring and strpos to extract this

$spos = strpos($getContent,"mp4=");
if($spos) {
$spos = $spos+4;//4 for four charactars mp4= 
$epos = strpos($getContent,' ',$spos) - $spos;
$url = substr($getContent,$spos,$epos);
echo $url;
}