Build, test, and debug regular expressions
Matches lines (multiline mode) that start with optional indentation followed by the keyword 'Device' and one or more space-delimited identifiers of the form two word characters, two digits, then 'PRI' (e.g., AB12PRI). The identifier list is captured in group 1 for extraction. Commonly used to parse device/port header lines from MCS/RPDS network equipment reports or CLI output logs.