/**
* Replaces plain-text links to YouTube videos with YouTube embeds.
*
* @param string $content HTML content
* @return string The content with embeds instead of URLs
*/
function youtube_link($content)
{
return jetpack_preg_replace_callback_outside_tags('!(?:\\n|\\A)https?://(?:www\\.)?(?:youtube.com/(?:v/|playlist|watch[/\\#?])|youtu\\.be/)[^\\s]+?(?:\\n|\\Z)!i', 'youtube_link_callback', $content, 'youtube.com/');
}
/**
* Replaces shortcodes and plain-text URLs to Vimeo videos with Vimeo embeds.
* Covers shortcode usage [vimeo 1234] | [vimeo https://vimeo.com/1234] | [vimeo http://vimeo.com/1234]
* Or plain text URLs https://vimeo.com/1234 | vimeo.com/1234 | //vimeo.com/1234
* Links are left intact.
*
* @since 3.7.0
* @since 3.9.5 One regular expression matches shortcodes and plain URLs.
*
* @param string $content HTML content
* @return string The content with embeds instead of URLs
*/
function vimeo_link($content)
{
/**
* [vimeo 12345]
* [vimeo http://vimeo.com/12345]
*/
$shortcode = "(?:\\[vimeo\\s+[^0-9]*)([0-9]+)(?:\\])";
/**
* http://vimeo.com/12345
* https://vimeo.com/12345
* //vimeo.com/12345
* vimeo.com/some/descender/12345
*
* Should not capture inside HTML attributes
* [Not] <a href="vimeo.com/12345">Cool Video</a>
* [Not] <a href="https://vimeo.com/12345">vimeo.com/12345</a>
*
* Could erroneously capture:
* <a href="some.link/maybe/even/vimeo">This video (vimeo.com/12345) is teh cat's meow!</a>
*/
$plain_url = "(?:[^'\">]?\\/?(?:https?:\\/\\/)?vimeo\\.com[^0-9]+)([0-9]+)(?:[^'\"0-9<]|\$)";
return jetpack_preg_replace_callback_outside_tags(sprintf('#%s|%s#i', $shortcode, $plain_url), 'vimeo_link_callback', $content, 'vimeo');
}
