${^MATCH} This is similar to $& ($MATCH
$DEBUGGING
$[ This variable stores the index of the first element in an array, and of the first character in a substring. The default is 0, but you could
$b Special package variables when using sort()
$$ The process number of the Perl running this script. Though you can set this variable, doing so is generally discouraged, although
$WARNING
$^W The current value of the warning switch, initially true if -w was used, false otherwise, but directly modifiable.
$0 Contains the name of the program being executed. On some (but not all) operating systems assigning to
%+ Similar to @+ , the %+ hash allows
$] The revision, version, and subversion of the Perl interpreter, represented as a decimal of the form 5.XXXYYY, where XXX is the version /
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