Issue #2350253 by genjohnson: Fixed Link with ! (exclamation) in URL query...

Issue #2350253 by genjohnson: Fixed Link with ! (exclamation) in URL query returns "not a valid URL".

link.module

@@ -1252,7 +1252,7 @@ function link_validate_url($text) {
 
   $directories = "(?:\/[a-z0-9" . $LINK_ICHARS . "_\-\.~+%=&,$'#!():;*@\[\]]*)*";
   // Yes, four backslashes == a single backslash.
-  $query = "(?:\/?\?([?a-z0-9" . $LINK_ICHARS . "+_|\-\.~\/\\\\%=&,$'():;*@\[\]{} ]*))";
+  $query = "(?:\/?\?([?a-z0-9" . $LINK_ICHARS . "+_|\-\.~\/\\\\%=&,$'!():;*@\[\]{} ]*))";
   $anchor = "(?:#[a-z0-9" . $LINK_ICHARS . "_\-\.~+%=&,$'():;*@\[\]\/\?]*)";
 
   // The rest of the path for a standard URL.