Exclamation mark is a valid and safe character in a URI. props hakre. fixes #8904

git-svn-id: http://svn.automattic.com/wordpress/trunk@11147 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/pluggable.php

@@ -876,7 +876,7 @@ if ( !function_exists('wp_sanitize_redirect') ) :
  * @return string redirect-sanitized URL
  **/
 function wp_sanitize_redirect($location) {
-	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%]|i', '', $location);
+	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%!]|i', '', $location);
 	$location = wp_kses_no_null($location);
 
 	// remove %0d and %0a from location