Question: Write a regular expression to match a valid US phone number, assuming there are two acceptable formats: (315) 1234567, (800) 123-4567. Test your regular expression

Write a regular expression to match a valid US phone number,

Write a regular expression to match a valid US phone number, assuming there are two acceptable formats: (315) 1234567, (800) 123-4567. Test your regular expression using "grep

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