Question: Define a regular expression for validating each of the following: a. A U.S. zip code, which must have five digits, followed by an optional hyphen

Define a regular expression for validating each of the following:

a. A U.S. zip code, which must have five digits, followed by an optional hyphen and four digits.

b. A telephone number in the format (aaa) nnn-nnnn, where aaa represents the area code and the ns represent digits.

c. The alphabetic derivation code illustrated in this chapter for a magazine subscriber. The format is 99999XXX9999XXX, where X represents a letter and 9 represents a number.

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