$OUTPUT_RECORD_SEPARATOR

$NR

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

HANDLE->format_top_name(EXPR)

${^RE_TRIE_MAXBUF} Controls how certain regex optimisations are applied and how much memory they utilize. This value by default is 65536 which

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

$^E Error information specific to the current operating system. At the moment, this differs from $!

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

@_ Within a subroutine the array @_ contains the parameters passed to that subroutine. Inside

${^ENCODING} DEPRECATED!!! The object reference to the Encode