$<digits> ($1, $2, ...) Contains the subpattern from the corresponding set of capturing parentheses from the last successful pattern

$< The real uid of this process. You can change both the real uid and the effective uid at the same time by using

$( The real gid of this process. If you are on a machine that supports membership in multiple groups simultaneously, gives a space separated

${^GLOBAL_PHASE} The current phase of the perl interpreter. Possible values are:

$- The number of lines left on the page of the currently selected output channel. Mnemonic: lines_on_page -

$LAST_PAREN_MATCH

${^CHILD_ERROR_NATIVE} The native status returned by the last pipe close, backtick (`` )

HANDLE->format_top_name(EXPR)

$` The string preceding whatever was matched by the last successful pattern match, not counting any matches hidden within a BLOCK or

$^I The current value of the inplace-edit extension. Use