in reply to numerically named vars
in thread search, replace and backrefrences
From perldoc perlvar:
Cheers,
Shendal
$<digits>
Contains the subpattern from the corresponding set of parentheses in the last pattern matched, not counting patterns matched in nested blocks that have been exited already. (Mnemonic: like \digits.) These variables are all read-only.
Cheers,
Shendal
In Section
Seekers of Perl Wisdom