For a pattern operation, the <_> placeholder can be replaced by any valid index or wildcard character that can be used to access an element of an array or a table. The $IfTable variable is a table that contains information about the network interfaces of a device1. The InstanceID attribute is a unique identifier for each interface2. To access the InstanceID of a specific interface, the pattern operation can use the following syntax:
$IfTable[].InstanceID
where is either:
A numeric index that corresponds to the position of the interface in the table, such as 3 for the third interface.
A dot (.) followed by a key-value pair that matches a specific attribute and value of the interface, such as [.Name=eth0] for the interface with the name eth0.
An asterisk () that represents a wildcard that matches any interface in the table, such as [] for all interfaces.
[:, 1: IfTable - Product Documentation: San Diego - ServiceNow, 2: InstanceID - Product Documentation: San Diego - ServiceNow, , ]
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