| Usage | Notation |
|---|---|
| definition | = |
| concatenation | , |
| termination | ; |
| alternation | | |
| optional | [ ... ] |
| repetition | { ... } |
| grouping | ( ... ) |
| terminal string | " ... " |
| terminal string | ' ... ' |
| comment | (* ... *) |
| special sequence | ? ... ? |
| exception | - |
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Extended Backus-Naur Form Cheatsheet
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