Writing plsql function to find out repeating character in a string

Question

I need to write one pl sql function to compare 2 consecutive character in a word that they are same or not, if same return false otherwise return true. could any one help me on this
what i have written pasting here code or make me correct
CREATE OR REPLACE FUNCTION validate_password (v_string IN VARCHAR2)
RETURN BOOLEAN
IS
v_number NUMBER (3) := 1;
i_length NUMBER (3);
BEGIN
SELECT LENGTH (v_string) INTO i_length FROM DUAL;
IF (i_length > 0)
THEN
FOR v_number IN v_number .. i_length
LOOP
substring (v_string, v_number, 1) :=
substring (v_string, v_number + 1, 1);
v_number := v_number + 1;
END LOOP;
END IF;
RETURN v_string;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('message');
END;
Thanks in advance.

Answer 1

no need to SELECT FROM DUAL;
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[code]
CREATE OR replace FUNCTION Validate_password (v_string IN VARCHAR2)
RETURN BOOLEAN
IS
  v_number NUMBER (3) := 1;
  i_length NUMBER (3);
BEGIN
    i_length  := Length (v_string) ;
    IF ( i_length > 0 ) THEN
      FOR v_number IN v_number .. i_length LOOP
          Substring (v_string, v_number, 1) :=
          Substring (v_string, v_number + 1, 1)
          v_number := v_number + 1;
      END LOOP;
    END IF;
    RETURN v_string;
EXCEPTION
  WHEN OTHERS THEN
             dbms_output.Put_line ('message');
END;
[/code]