- var_dump: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$string = 'Lorem ipsum dolor sit amet, consetetur sadipscing www.loremipsum.com/asd/fgh/jkl elitr, sed diam ';
$regex= '#www\.\S+#';
preg_match_all($regex,$string, $matches);
var_dump($matches);