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regular express for invalid character

Hi expert,

I want to create a cds table for sap BW report, I want to compile a regular express as below : replace all invalid characters with '' in text field, but I still get invalid characters error when displaying data in BW, can you please provide a correct version for this request:

the invalid characters rule of BW is:


Characteristic values that only consist of the character # or that begin with ! are not valid.

      replace_regexpr( '[^!%^&*()_+=A-Za-z1234567890]'  IN ZTEXT  with '' occurrence all
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