NAME
$<digits> ($1, $2, ...) Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern
$! When referenced, $! retrieves the current value of the C
${^WARNING_BITS} The current set of warning checks enabled by the
$ARGV Contains the name of the current file when reading from <> .
$# $# was a variable that could be used to format printed numbers. After a deprecation cycle
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