Problem 91. Get the area codes from a list of phone numbers

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Given a string of text with phone numbers in it, return a unique'd cell array of strings that are the area codes.
 s = '508-647-7000, (508) 647-7001, 617-555-1212';
then
 a = {'508','617'}
Note: This problem refers to American-style phone numbers. You can assume the first three digits of a ten-digit number will always be the area code.

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Last Solution submitted on Jan 15, 2025

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Rafael S.T. Vieira on 12 Jun 2020

The problem fails to mention that the area codes should be sorted, and that phone numbers may have country codes.

Rik on 15 Jan 2021

This isn't about American-style phone numbers, but US-style. Otherwise it would be nice to include other test cases so people would be required to actually parse the country code away. Now it is just a matter of removing a leading 1.

Tran Tran on 31 Jul 2022

Madness of cellfun regexp

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Problem 91. Get the area codes from a list of phone numbers

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Problem 91. Get the area codes from a list of phone numbers

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