$<digits> ($1, $2, ...) - Perldoc Browser

variables / $<digits> ($1, $2, ...)

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#$<digits> ($1, $2, ...): Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern match, not counting patterns matched in nested blocks that have been exited already. (Mnemonic: like \digits.) These variables are all read-only and dynamically scoped to the current BLOCK.