search changed for wp_capabilities

@@ -48,6 +48,13 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
         $having = " HAVING `json` LIKE ";
         if (is_array($field_match) && count($field_match) > 0) {
             foreach ($field_match as $key => $val) {
+                if($key == 'wp_capabilities'){
+                    $pieces = explode("\"", $val);
+                    $pieces = explode("\\", $pieces[1]);
+                    $key = $pieces[0];
+                    $having_clause .= (empty($having_clause) ? $having : "\n AND `json` LIKE ");
+                    $having_clause .= " '%{$key}%' ";
+                }else{
                 if (!in_array($key, $this->fields)) {
                     $this->fields[] = $key;
                 }
@@ -56,6 +63,7 @@ class UserSearch implements ArrayAccess, Iterator, Countable {
                 $having_clause .= " '%\"{$key}\":\"{$val}%' ";
             }
             }
+        }
 
         // Open ended search
         if (!is_null($text_search)) {