Question: Question 1 Give a regular expression over the alphabet ={a,b} for the set of words in which the substring ' ab ' does not occur:

Question 1 Give a regular expression over the alphabet ={a,b} for the set of words in which the substring ' ab ' does not occur: For example, "baa" will be accepted but "aab" will not. [2 marks] Question 2 Consider the regular expression (ab)a. In a step-by-step fashion, using the rules from Handout 2b, convert each sub-expression of the regular expression into an NFA and, by doing so, obtain a DFA that is equivalent to the overall regular expression. [5 marks]

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