?? bnf.ok
字號:
EBNF = { Production } .
Production = nonterminal "=" Expression "." .
Expression = Term { "|" Term } .
Term = Factor { Factor } .
Factor = nonterminal
| terminal
| "[" Expression "]"
| "(" Expression ")"
| "{" Expression "}" .
nonterminal = letter {letter | lowline | digit} .
terminal = "'" noquote1 {noquote1} "'" | '"' noquote2 {noquote2} '"' .
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