| option | description |
|---|---|
| k | Specify the exact lookahead to be used by the subrule. |
| greedy | Valid values are true and false. Default is true. Normally symbols are matched greedily so that if a symbol can be matched immediately or by exiting the subrule the parser chooses to match the symbol immediately. |
| backtrack | Rule-specific version of the backtrack grammar option. See Grammar options for details. |
| memoize | Rule-specific version of the memoize grammar option. See Grammar options for details. |
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