@- $-[0] is the offset of the start of the last successful match

@+ This array holds the offsets of the ends of the last successful submatches in the currently active dynamic scope.

$[ 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

$^W The current value of the warning switch, initially true if -w was used, false otherwise, but directly modifiable.

$$ The process number of the Perl running this script. Though you can set this variable, doing so is generally discouraged, although

%+ Similar to @+ , the %+ hash allows

$> The effective uid of this process. For example: $<

$^H WARNING: This variable is strictly for internal use only. Its availability, behavior, and contents are subject to change without notice

ARGVOUT The special filehandle that points to the currently open output file when doing edit-in-place processing with -i. Useful when

$^N The text matched by the used group most-recently closed (i.e. the group with the rightmost closing parenthesis) of the last successful