Feature 1255: modification in sql queries

- manage random function
    - manage regex syntax
    - manage quote (single instead of double)
    - manage interval

git-svn-id: http://piwigo.org/svn/trunk@4367 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/include/functions_metadata.php

@@ -246,7 +246,7 @@ SELECT id
     if ($recursive)
     {
       $query.= '
-    AND uppercats REGEXP \'(^|,)'.$category_id.'(,|$)\'
+    AND uppercats '.DB_REGEX_OPERATOR.' \'(^|,)'.$category_id.'(,|$)\'
 ';
     }
     else