Question: In a regular expression to search for a phone number. (?d{3})?[. -]? *d{3}[. -]? *[. -]?d{4} a. What does the d indicate? b. What does

In a regular expression to search for a phone number. \(?\d{3}\)?[. -]? *\d{3}[. -]? *[. -]?\d{4}

a. What does the \d indicate?

b. What does the {3} indicate?

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