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Request information about only those instances of a configuration object type at the specified level in the configuration hierarchy that have the specified set of characters in their identifier names (characters that match a regular expression). If the attribute is omitted, the Junos XML protocol server returns the complete set of child tag elements for the specified parent level.

The attribute can be combined with one or more of the count, recurse, and start attributes.

To represent the objects to return, the matching-expression value uses a slash-separated list of hierarchy level and object names similar to an XML Path Language (XPath) representation. Each level in the representation can be either a full level name or a regular expression that matches the identifier name of one or more instances of an object type:

The regular expression uses the notation defined in POSIX Standard 1003.2 for extended (modern) UNIX regular expressions. For details about the notation, see Requesting Subsets of Configuration Objects Using Regular Expressions.