- preg_match: documentation ( source)
- print_r: documentation ( source)
- preg_quote: documentation ( source)
<?php
$needle = 'www';
$sentence = 'This www.google.com is the http://www.facebook.com website that https://www.amazon.com make me awesome';
if(preg_match('/\b(' . preg_quote($needle, '/') . '\w+)/', $sentence, $match)){
echo "<pre>";
print_r($match[0]);
echo "</pre>";
}