diff --git a/lib/common.lib.php b/lib/common.lib.php
index 3da20636f..fade7b145 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -216,7 +216,7 @@ function url_auto_link($str)
     // http://sir.kr/pg_lecture/463
     $str = str_replace(array("<", ">", "&", """, " ", "'"), array("\t_lt_\t", "\t_gt_\t", "&", "\"", "\t_nbsp_\t", "'"), $str);
     //$str = preg_replace("`(?:(?:(?:href|src)\s*=\s*(?:\"|'|)){0})((http|https|ftp|telnet|news|mms)://[^\"'\s()]+)`", "<A HREF=\"\\1\" TARGET='{$config['cf_link_target']}'>\\1</A>", $str);
-    $str = preg_replace("/([^(href=\"?'?)|(src=\"?'?)]|\(|^)((http|https|ftp|telnet|news|mms):\/\/[a-zA-Z0-9\.-]+\.[가-힣\xA1-\xFEa-zA-Z0-9\.:&#=_\?\/~\+%@;\-\|\,\(\)]+)/i", "\\1<A HREF=\"\\2\" TARGET=\"{$config['cf_link_target']}\">\\2</A>", $str);
+    $str = preg_replace("/([^(href=\"?'?)|(src=\"?'?)]|\(|^)((http|https|ftp|telnet|news|mms):\/\/[a-zA-Z0-9\.-]+\.[가-힣\xA1-\xFEa-zA-Z0-9\.:&#!=_\?\/~\+%@;\-\|\,\(\)]+)/i", "\\1<A HREF=\"\\2\" TARGET=\"{$config['cf_link_target']}\">\\2</A>", $str);
     $str = preg_replace("/(^|[\"'\s(])(www\.[^\"'\s()]+)/i", "\\1<A HREF=\"http://\\2\" TARGET=\"{$config['cf_link_target']}\">\\2</A>", $str);
     $str = preg_replace("/[0-9a-z_-]+@[a-z0-9._-]{4,}/i", "<a href=\"mailto:\\0\">\\0</a>", $str);
     $str = str_replace(array("\t_nbsp_\t", "\t_lt_\t", "\t_gt_\t", "'"), array("&nbsp;", "&lt;", "&gt;", "&#039;"), $str);