%LAST_MATCH_START

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

$. Current line number for the last filehandle accessed. Each filehandle in Perl counts the number of lines

$~ The name of the current report format for the currently selected output channel. The default format name is the same as the filehandle name

$NR

@LAST_MATCH_START

$* $* was a variable that you could use to enable multiline matching. After a deprecation

$SUBSEP

${^POSTMATCH} This is similar to $' ($POSTMATCH

$PERLDB