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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1276 Solutions
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Last Solution submitted on Apr 07, 2020

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3 Comments

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.

Solution Comments

Solution 1195679

1 Comment

1 Comment

Informaton on 23 May 2017

Apparently the order needs to be the same as that defined by the test suite; which is not in the order of the phone numbers given :(

Solution 443029

1 Comment

1 Comment

Pascal Geschwill on 15 May 2014

Is there a way to execute regexp/regexprep with multiple expresssions at the same time?

Solution 398499

1 Comment

1 Comment

Informaton on 23 May 2017

regexp hack

Solution 372579

1 Comment

1 Comment

Robert on 19 Dec 2013

Not sure what's going on here, but it works in my actual MATLAB program, and Octave.

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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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Last 200 Solutions

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