Regular expressions
Define the term Regular expressions ?
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R is a regular expression if R is– a, for some a ∈Σ– ε, the empty string– Ø, the empty set– (R1 ∪ R2), where R1 and R2 are reg. exprs.– (R1° R2), where R1 and R2 are reg. exprs.– (R1*), where R1 is a regular expression
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