This read-write OCTET STRING (0-128 bytes) holds a regular expression matching an entire URI at once, unused if left as a zero-length string, mutually exclusive with the field-specific patterns like cvSIPUriClassCfgUserIDPattern, and given the lowest matching priority when multiple classes match a URI based on this whole-URI pattern. Administrators use it for simpler or catch-all classification rules that don't need to isolate a specific URI component. For example, an admin building a fallback classification rule for any otherwise-unclassified URI would use this whole-URI pattern, knowing it will only apply after more specific field-based classes have been checked.