| expression | → | format‑expression |
| format‑expression | → | binary‑expression (. format)? |
| format | → | id | dec id? |
| binary‑expression | → | term (weak‑operator term)* |
| weak‑operator | → | + | - | | | ^ |
| term | → | unary‑expression (strong‑operator unary‑expression)* |
| strong‑operator | → | * | / | % | << | >> | & |
| unary‑expression | → | ( expression ) | unary‑operator unary‑expression | primary‑expression |
| unary‑operator | → | + | - | ~ | * |
| primary‑expression | → | seg | reg | hex | dec | id |