Using the ' in PLSQL

I wish to replace ' in a column of a table in PL/SQL. I know the escape sequence in sqlplus but it doesnt work in pl/sql. so what do I do?
for example I want
replace(column_name,''','')
thanks in advance

SQL> select :a, replace (:a, '''', '') from dual;
:A REPLACE(:A,'''','')
This's test Thiss test

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Well, here's your query formatted for people to read...
MERGE INTO voter dst
USING (SELECT voterid,
              pollingstation || CASE WHEN ROW_NUMBER () OVER ( PARTITION BY pollingstation ORDER BY surname, firstnames) <= 1000
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;In future, please read {message:id=9360002} and post relevant details.
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[pre]
Message was edited by:
        Pierre Forstmann
Message was edited by:
        Pierre Forstmann

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