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It has to be a validation and with the help of my teammate..Got a rather simple solution/workaround.
A nested Replace String function to replace all the allowed special characters with "Nothing" and at the end we should/would get a string which is only alpha numeric with spaces. For E.g. In the above expression alllowed special characters are # and @. To Include more special characters expand the nest of ReplaceStr.
If the IsAlphaNumeric produces a False the validation fails, and passes if it produces True.
Hope it made sense.