The text matched by the highest used capture group of the last successful search pattern. (See"Scoping Rules of Regex Variables"). It is logically equivalent to the highest numbered capture variable ($1,$2, ...) which has a defined value.
This is useful if you don't know which one of a set of alternative patterns matched. For example:
/Version: (.*)|Revision: (.*)/ && ($rev = $+);This variable is read-only, and its value is dynamically scoped.
Mnemonic: be positive and forward looking.
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