Question: Why is it important to use the raw-string indicator (r) in regular-expression search patterns? In replacement strings? Write a verification function that recognizes phone numbers

Why is it important to use the raw-string indicator (r) in regular-expression search patterns? In replacement strings?

Write a verification function that recognizes phone numbers under the old format, in which the area codethe first three digitswas optional. (When omitted, the implication was that the phone number was local.)

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