David Fetter wrote:

The question is, what is the use case?  If there is one in Perl, can
this proposed function API support it?

Perl makes the following variables available in any regex match,
although it optimizes some cases for when they're not there:

$1, ... $n (captured matches in parentheses)
$`         (pre-match)
$'         (post-match)
$&         (whole match)

Use of any of these is notoriously costly, BTW, especially pre-match and post-match. See perlre man page.



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