diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index cc5e76bdb5..7735d581a4 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -582,10 +582,11 @@ function antispambot($emailaddy, $mailto=0) {
 }
 
 function make_clickable($ret) {
-	$ret = ' ' . $ret . ' ';
-	$ret = preg_replace("#([\s>])(https?)://([^\s<>{}()]+[^\s.,<>{}()])#i", "$1<a href='$2://$3' rel='nofollow'>$2://$3</a>", $ret);
-	$ret = preg_replace("#(\s)www\.([a-z0-9\-]+)\.([a-z0-9\-.\~]+)((?:/[^ <>{}()\n\r]*[^., <>{}()\n\r]?)?)#i", "$1<a href='http://www.$2.$3$4' rel='nofollow'>www.$2.$3$4</a>", $ret);
-	$ret = preg_replace("#(\s)([a-z0-9\-_.]+)@([a-z0-9\-_.]+)\.([^,< \n\r]+)#i", "$1<a href=\"mailto:$2@$3.$4\">$2@$3.$4</a>", $ret);
+	$ret = ' ' . $ret;
+	$ret = preg_replace("#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "$1<a href='$2' rel='nofollow'>$2</a>", $ret);
+	$ret = preg_replace("#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "$1<a href='http://$2' rel='nofollow'>$2</a>", $ret);
+	$ret = preg_replace("#(\s)([a-z0-9\-_.]+)@([^,< \n\r]+)#i", "$1<a href=\"mailto:$2@$3\">$2@$3</a>", $ret);
+	$ret = substr($ret, 1);
 	$ret = trim($ret);
 	return $ret;
 }