Conceptintro
Backreference
Also called back-reference, regex backreference.
A construct that matches the same text as an earlier capture group, which takes the language beyond regular.
A construct that matches the same text as an earlier capture group, which takes the language beyond regular.
About this page
The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.
| Ladder | Level | What the next level needs |
|---|---|---|
| Human proof | H0 no proof |
|
| Lean | L0 no Lean part |
|
| Visual | V0 none |
|
| Writing | W0 stub |
|
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