Index: clientside_validation_fapi/clientside_validation_fapi.module
===================================================================
--- clientside_validation_fapi/clientside_validation_fapi.module	(revision 12)
+++ clientside_validation_fapi/clientside_validation_fapi.module	(working copy)
@@ -105,7 +105,7 @@
       $type = 'digit';
     case 'fapi_validation_rule_regexp':
       if ($callback == 'fapi_validation_rule_regexp') {
-        $expressions['fapi_validation_rule_regexp'] = $params[0];
+        $expressions['fapi_validation_rule_regexp'] = $params;
         $type = 'regexp';
       }
       if (strpos($message, '%field') !== FALSE) {