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正则定义的例⼦子2<br />
Pascal无符号数集合,例1946,11.28,63.6E8,1.99E-‐6<br />
digit → 0 | 1 | … | 9<br />
digits → digit digit *<br />
optional_fraction → .digits|ε<br />
optional_exponent → (E ( + | -‐ | ε ) digits ) | ε<br />
num → digits optional_fraction optional_exponent<br />
10.
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