Regex clickable URL from plain string

clickable_url.php

function clickable_url($plain_text)
{
	// check all url with http:// pattern
	$pattern_http = '~([^<>]*>)(*SKIP)(*F)|'; 										// skip url check if inside html tag
	$pattern_http .= '([-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+.[a-zA-Z])(*SKIP)(*F)|';	// skip email pattern
	$pattern_http .= '(?:(?:ht|f)tps?://)';											// find url with http | https | ftp | ftps
	$pattern_http .= '[\w-]+';														// host name
	$pattern_http .= '(?:\.[\w-]+)+';												// domain name
	$pattern_http .= '[\w-.,@?^=%&:/\~+#!]*[\w-@?^=%&/\~+#]~xiuS';					// path name

	$result = preg_replace($pattern_http, '<a href="$0" target="_blank">$0</a>', $plain_text);

	// check all url without http:// pattern
	$pattern = '~([^<>]*>)(*SKIP)(*F)|';										// skip url check if inside html tag
	$pattern .= '([-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+.[a-zA-Z])(*SKIP)(*F)|';		// skip email pattern
	$pattern .= '(?:(?:ht|f)tps?://)[\w-]+';									// skip url with http | https | ftp | ftps
	$pattern .= '(?:\.[\w-]+)+';
	$pattern .= '[\w-.,@?^=%&:/\~+#!]*[\w-@?^=%&/\~+#](*SKIP)(*F)|';
	$pattern .= '(|(?:(?:ht|f)tps?://|www\.))';									// find url without http | https | ftp | ftps
	$pattern .= '[\w-]+';														// host name
	$pattern .= '(?:\.[\w-]+)+';												// domain name
	$pattern .= '[\w-.,@?^=%&:/\~+#!]*[\w-@?^=%&/\~+#]~xiuS';					// path name

	$result = preg_replace($pattern, '<a href="http://$0" target="_blank">$0</a>', $result);
	
	// Double check regex because sometime there have URL without www or http when change to html href, browser detect there is url part of parent url
	
	return $result;
}