Regex Help for URL's

Can someone help me modify the following code? It was designed to search for all instances of [LEVEL#]...[/LEVEL#] I need a preg_match_all that will search for all of instances of an URL. It should be sophisticated enough to find something as complicated as this: http(s)://x.y.z.domain.com/dir/dir/file.name.ext?query=1&query=2#anchor Any help would be greatly appreciated! preg_match_all('#\[LEVEL([0-9])\](.*)\[/LEVEL[0-9]]#Uim', $arcContent, $tmpMatches); $arcContent = preg_replace('#\[LEVEL([0-9])\](.*)\[/LEVEL[0-9]]#Uim', '###URL###', $arcContent);