R l r ε u l r u l rr u l rrr example l a ε a aa aaa

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r* : L ( r* ) = { ε } U L ( r ) U L ( rr ) U L ( rrr ) … example) L ( a* ) = { ε , a, aa, aaa, … } L ( a* ) = L ( a ) * L ((a|bb) * ) = L (a|bb)* Regular expressions 2014 컴파일러 11
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