How to find 2 different characters from a string

Hi All,
I would like to remove 'T' and 'Z' from "20110428T10:33:45Z" and convert the string in date/time. I was looking at instr function but that allows to search for one character only.
Thans for the help.

With 10g
SELECT REGEXP_REPLACE ('20110428T10:33:45Z', '[T|Z]') dt
FROM DUAL
DT
2011042810:33:45
1 row selected.For the conversion
SELECT TO_DATE (REGEXP_REPLACE ('20110428T10:33:45Z', '[T|Z]'),
                'YYYYMMDDHH24:MI:SS'
               ) dt
FROM DUAL
DT
2011-04-28 10:33:45
1 row selected.

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