Exclude PO Box string value in AddressLine1 field for Address Validation

Summary:

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When an employee attempts to add a P.O Box in their home address, the system will not allow them to save. So i tried with using Field Validation rule in autocomplete rule section, but not working as expected. I have to exclude fields such as P.O.Box,PO Box,PO. Box.P O BOX,P.O BOX etc in AddressLine1 field.

Can anyone help me a better validation condition(Working) to satisfy addressline1 should not contain any values with PO Box as mentioned above? Really appreciated for providing solution in autocomplete rule.

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