Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern match in the current dynamic scope. (See"Scoping Rules of Regex Variables".)
Note there is a distinction between a capture buffer which matches the empty string a capture buffer which is optional. Eg,(x?) and(x)? The latter may be undef, the former not.
These variables are read-only.
Mnemonic: like \digits.
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