troubleshooting Question

Ensure a passed string is alphanumeric

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cookiejarFlag for United States of America asked on
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Could you please give me a method to determine if a string is alphanumeric and how to throw and error if  not.

 For example, I am passed a string and it  is used in a select statement as the table name.  If any strange characters are in the table name, the SQL will error out.
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