ScienceLogic Policy/Variable API
Policy variables can be used in compliance rules as variable replacements, referenced with the `$replace$` format, where `replace` is the variable name you have defined. This enables you to use a variable as shorthand for configuration elements, that are likely to be referenced multiple times. For instance, if you create a definition of `Gateway`, and assign it a Value of `192.168.0.1`, you can then use it in a compliance rule, e.g. a Configuration rule the Must Contain the Regex `ip default-gateway $Gateway$`. This rule will be expanded to `ip default-gateway 192.168.0.1`. If later, the gateway address changes, simply change the `Value` of the Gateway variable definition, and all rules that use the `$Gateway$` variable will be updated automatically.