How many different patterns can be described

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Reference no: EM131855219

Problem

1. Explain how you would modify the nondeterministic machine to handle "don't-care" characters.

2. How many different patterns can be described by a regular expression with M or operators and no closure operators?

3. Modify match to handle regular expressions with the not function and "don't-care" characters.

4. Show how to construct a pattern description of length M and a text string of length N for which the running time of match is as large as possible.

Reference no: EM131855219

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