How can i validate wild characters.

Hi
i am having peculiar problem . in my report  i have a parameter where user is asked to enter postal code. to validate that field i need to see that he is not entering any wild character(*,!.@.#,$....) like that. how can i do that
help me out.
Thanks,
Nagaraju.

<b>PARAMETERS: p_post type char10.
AT SELECTION-SCREEN On p_post.
if p_post CO sy-abcde.
only alphabets
elseif p_post CO int_char.
only numberics
else.
message e000(ZDMW) with 'Invalid Post code'.
endif.</b>
Reward points if this Helps.
Manish
Message was edited by:
        Manish Kumar
Message was edited by:
        Manish Kumar

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