$` | Text before match |
$& | Text matched |
$' | Text after match |
$1 | Text matched within 1st set of parentheses |
$2 | Text matched within 2nd set of parentheses |
$+ | Text from highest-numbered $1, $2, etc. |
$^N | Text from most recently closed $1, $2, etc. |
@- | Array of match-start indices into target text |
@+ | Array of match-end indices into target text |
$^R | Most recently executed embedded-code sonstruct |