5. Describe informally the kind of pattern that matches the following extended regular expression: [b-d]a?e+ and rewrite it u 5. Describe informally the kind of pattern that matches the following extended regular expression: [b-d]a?e+ and rewrite it using only the basic (not extended) features of formal regular expressions. [For example, character classes [.1 positive closures +, and optionals? are not basic features, and should be expressed using only the basic taxonomy instead]. [4 marks 6. Explain the assertion that ” there is more to taking Compiler Construction course than solely at writing a typical compiler” aiming [3 marks



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