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$LAST_PAREN_MATCH
$+

The text matched by the last bracket of the last successful search pattern. This is useful if you don't know which one of a set of alternative patterns matched. For example:

/Version: (.*)|Revision: (.*)/ && ($rev = $+);

(Mnemonic: be positive and forward looking.) This variable is read-only and dynamically scoped to the current BLOCK.