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** Regular expression patterns: Occasionally, text fields must be validated this way. For example, North American phone numbers may be required to have the pattern 999-999-9999.
** Cross-field validation: Certain conditions that utilize multiple fields must hold. For example, in laboratory medicine, the sum of the components of the differential white blood cell count must be equal to 100 (since they are all percentages). In a hospital database, a patient's date of discharge from the hospital cannot be earlier than the date of admission.
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