| $` | 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 |