How to replace specific values in a oracle database column?

Question

I am looking to replace values in a particular column. For example the following column values

column name
----------
Test1
Test2
Test3
Test12

Answer 1

I'm using Version 4.0.2.15 with Build 15.21

For me I needed this:

UPDATE table_name SET column_name = REPLACE(column_name,"search str","replace str");

Putting t.column_name in the first argument of replace did not work.