Accepting "!"-links as tags. (They are used at statusnet for groups)

include/text.php

@@ -749,7 +749,7 @@ function get_tags($s) {
 	// Otherwise pull out single word tags. These can be @nickname, @first_last
 	// and #hash tags.
 
-	if(preg_match_all('/([@#][^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/',$s,$match)) {
+	if(preg_match_all('/([!#@][^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/',$s,$match)) {
 		foreach($match[1] as $mtch) {
 			if(strstr($mtch,"]")) {
 				// we might be inside a bbcode color tag - leave it alone
@@ -2168,7 +2168,7 @@ function normalise_openid($s) {
 
 function undo_post_tagging($s) {
 	$matches = null;
-	$cnt = preg_match_all('/([@#])\[url=(.*?)\](.*?)\[\/url\]/ism',$s,$matches,PREG_SET_ORDER);
+	$cnt = preg_match_all('/([!#@])\[url=(.*?)\](.*?)\[\/url\]/ism',$s,$matches,PREG_SET_ORDER);
 	if($cnt) {
 		foreach($matches as $mtch) {
 			$s = str_replace($mtch[0], $mtch[1] . $mtch[3],$s);