Function Module tto check special characters in a field

Hi All,
I have a requriemnt where i need to make sure there are no special characters allowed
in a paremeter ( is there any functional module to check it)
r anyway to work with
Thank in advance for u replies.
Regards,
Riyaz.

DATA: vergleich_string(100) VALUE
          'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.
  CONCATENATE vergleich_string ' 1234567890,./!@#$%&*-_+=~|\[{]}()"'
                                               INTO vergleich_string.
use condition.
if var ca vergleich_string.
raise error message.
endif.

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