I have stucked into a typical php string program. I have a data string like

$str="{heading}
{youtube}4vfOPm6wfyI{/youtube}
{/heading}
<p>Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium</p>";

now i want the 4vfOPm6wfyI , the id of the link. How it will be done?

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