A simple PHP code which parses the Youtube links from a text(paragraph) and then finds the video id from the URL.

some_php_link_parsing_not_for_production.php

// Pseudo code (Not for production)

$link_regex = "/(http|https)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/g"
preg_match_all($link_regex, $your_paragrah, $links_array)

// loop through links array and use the following code to parse url and variable
parse_str(parse_url( $url, PHP_URL_QUERY ), $vars );
echo $vars['v'];