Is there are a size limit for the returned value from substr?

It is seems to be limited to 4000.
But working with clob it is not enough.
Does someone have a quick workarround?
Thanks!

It is seems to be limited to 4000.use plsql:
michaels> DECLARE
   c   CLOB := RPAD ('x', 32767, 'x') || RPAD ('x', 32767, 'x');
BEGIN
   DBMS_OUTPUT.put_line ('Length clob: ' || LENGTH (c));
   DBMS_OUTPUT.put_line ('Length substring clob: ' || LENGTH (SUBSTR (c, 1, 50000)));
END;
Length clob: 65534
Length substring clob: 50000

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