SQL>
SQL> DECLARE
2 x NCHAR(40) := UNISTR('This is a \D834\DD1E test');
3 BEGIN
4 DBMS_OUTPUT.PUT_LINE (INSTR2(x, UNISTR('\D834')));
5 DBMS_OUTPUT.PUT_LINE (INSTR4(x, UNISTR('\D834')));
6 END;
7 /
PL/SQL procedure successfully completed.
SQL>