$/ The input record separator, newline by default. This influences Perl's idea of what a "line" is. Works like awk's RS variable, including
$+ The text matched by the last bracket of the last successful search pattern. This is useful if you don't know which one of a set of alternative
$LAST_REGEXP_CODE_RESULT
%LAST_PAREN_MATCH
$PREMATCH
$a
@_ Within a subroutine the array @_ contains the parameters passed to that subroutine. Inside
${^UNICODE} Reflects certain Unicode settings of Perl. See
$POSTMATCH
$BASETIME
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