* Some of those characters can be troublesome when auto-linking plain text. Such as "http://some.com/)"
* URL encoding should be used whenever a weird character is used, the following strings are not definitive.
*/
-define('URL_REGEX_VALID_PATH_CHARS', '\pN\pL\,\!\.\:\-\_\+\/\=\;\%\~\*');
+define('URL_REGEX_VALID_PATH_CHARS', '\pN\pL\,\!\.\:\-\_\+\/\@\=\;\%\~\*');
define('URL_REGEX_VALID_QSTRING_CHARS', URL_REGEX_VALID_PATH_CHARS . '\&');
define('URL_REGEX_VALID_FRAGMENT_CHARS', URL_REGEX_VALID_QSTRING_CHARS . '\?\#');
define('URL_REGEX_EXCLUDED_END_CHARS', '\?\.\,\!\#\:\''); // don't include these if they are directly after a URL