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8 lines
228 B
Racket
8 lines
228 B
Racket
7 years ago
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#lang brag
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;; test the curly quantifier
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7 years ago
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start : a-rule | b-rule | c-rule | d-rule | e-rule
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7 years ago
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a-rule : "a"{2} ; exactly 2
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b-rule : "b"{,2} ; up to 2
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c-rule : "c"{2,} ; 2 or more
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7 years ago
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d-rule : "d"{2,3} ; 2 or 3
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e-rule : "e"{} ; 0 or more
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