Replace ' with ' in my data using pl/sql

Question

I want to replace all occurrence of special characters like ' with ' in my data using pl/sql.
How can I achieve this?

Answer 1

Thank you for your quick reply. My code is:
DECLARE
firstname varchar2(200) := 'cccc&a p o s;dddd'; ---> Please remove spaces between a p o s. Combine them as apos
lastname varchar2(200) := 'eeee';
BEGIN
dbms_output.put_line('Before changing : firstname :' || firstname);
dbms_output.put_line('After changing: firstname :' || replace(LastName, "'" , "'") );
END;
When I run this in sqlplus, I see:
SQL> @EscapeCharTesting.sql
Enter value for apos:
So I want to change all occurences of "&a p o s;" to CHR(39)