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regexp_replace: LF, CR, or tab

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Hi!

I am trying to replace characters '\r', '\n', or '\t' with space character ' '. As an example, I want string "A\t\n\rB" becomes "AB".  The following statement seems to be not working. What mistake have I made?

TIA

CN
========

select regexp_replace(E'A\r\n\tB',E'[\r\n\t]',' ');
 regexp_replace 
----------------
 A 
         B
(1 row)

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