how to validate a text field which can be A,B,C,D, Null, or groups of A,B,C,D (ex. ‘A,B,C’ with commas no space).

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how to validate a text field which can be  A,B,C,D, Null, or groups of A,B,C,D (ex. ‘A,B,C’ with commas no space).

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