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grammars: document new repetition operators

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Olivier Chafik 2024-04-12 16:12:16 +01:00
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grammars/README.md
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@ -59,9 +59,13 @@ Parentheses `()` can be used to group sequences, which allows for embedding alte
## Repetition and Optional Symbols ## Repetition and Optional Symbols
- `*` after a symbol or sequence means that it can be repeated zero or more times. - `*` after a symbol or sequence means that it can be repeated zero or more times (equivalent to `{0,}`).
- `+` denotes that the symbol or sequence should appear one or more times. - `+` denotes that the symbol or sequence should appear one or more times (equivalent to `{1,}`).
- `?` makes the preceding symbol or sequence optional. - `?` makes the preceding symbol or sequence optional (equivalent to `{0,1}`).
- `{m}` repeats the precedent symbol or sequence exactly `m` times
- `{m,}` repeats the precedent symbol or sequence at least `m` times
- `{m,n}` repeats the precedent symbol or sequence at betwen `m` and `n` (included) times (included)
- `{,n}` repeats the precedent symbol or sequence at most `n` times (included)
## Comments and newlines ## Comments and newlines