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

Created by Cody Team

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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 Dec 12, 2024

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blaat on 10 Feb 2012

An explanation of common notations of area codes would be nice for us non-Americans :)

Aurelien Queffurust on 30 Mar 2012

I (as French) Agree. A Wikipedia link which would explain supported area codes is definitely missing.

David Verrelli on 14 Dec 2017

"You can assume the first three digits of a ten-digit number will always be the area code." Hmmm.... too bad there was no explanation applying to telephone numbers with more (or less?) than ten digits.

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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