Problem 44231. Is it a mail?

Created by Said BOUREZG

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{"parts":[{"partUri":"/matlab/document.xml","contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?><w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Electronic mail, or email, is a method of exchanging digital messages between people using digital devices such as computers, mobile phones and other electronics. Email first entered substantial use in the 1960s and by the mid-1970s had taken the form now recognized as email. Email operates across computer networks, which today is primarily the Internet. Write a function witch help you to verify if a string given is a mail address or not, true if you want to say yes it's a mail, and false if not a mail address. links may be help you:</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"#Link\"><w:r><w:t>1</w:t></w:r></w:hyperlink><w:r><w:t> ,</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"#Link\"><w:r><w:t>2</w:t></w:r></w:hyperlink></w:p></w:body></w:document>","relationship":null}],"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","target":"/matlab/document.xml","relationshipId":"rId1"}]}

<div style = "text-align: start; line-height: 20px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: normal; text-decoration: none; white-space: normal; "><div style="display: block; min-width: 0px; padding-top: 0px; transform-origin: 332px 63px; vertical-align: baseline; perspective-origin: 332px 63px; "><div style="font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-bottom: 9px; margin-left: 4px; margin-right: 10px; margin-top: 2px; text-align: left; transform-origin: 309px 63px; white-space: pre-wrap; perspective-origin: 309px 63px; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="display: inline; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; transform-origin: 0px 0px; perspective-origin: 0px 0px; "><span style="">Electronic mail, or email, is a method of exchanging digital messages between people using digital devices such as computers, mobile phones and other electronics. Email first entered substantial use in the 1960s and by the mid-1970s had taken the form now recognized as email. Email operates across computer networks, which today is primarily the Internet. Write a function witch help you to verify if a string given is a mail address or not, true if you want to say yes it's a mail, and false if not a mail address. links may be help you:</span></span><span style="display: inline; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; transform-origin: 0px 0px; perspective-origin: 0px 0px; "><span style=""> </span></span><a target='_blank' href = "https://www.mathworks.com/matlabcentral/cody/problems/44231-is-it-a-mail/edit#Link"><span style=""><span style="">1</span></span></a><span style="display: inline; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; transform-origin: 0px 0px; perspective-origin: 0px 0px; "><span style=""> ,</span></span><span style="display: inline; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; transform-origin: 0px 0px; perspective-origin: 0px 0px; "><span style=""> </span></span><a target='_blank' href = "https://www.mathworks.com/matlabcentral/cody/problems/44231-is-it-a-mail/edit#Link"><span style=""><span style="">2</span></span></a></div></div></div>

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96 Solutions
15 Solvers

Last Solution submitted on Dec 30, 2020

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3 Comments

3 Comments

Asif Newaz on 8 Mar 2020

problem in ur test case 2 & 4

Rafael S.T. Vieira on 10 Sep 2020

The test suite has problems according to RFC 3969 (https://www.rfc-editor.org/rfc/inline-errata/rfc3696.html): there should not be spaces in a domain address, nor can it be made with numbers only. When building a problem of such type, it is best to specify which RFC that you are using as a reference, or if its rules are made up (which should be described).

Case 2 is actually correct, because e-mails cannot be longer than 254 or 256 characters. But case 4 is not, and goes against case 16: both should be true or both should be false (to be consistent at the very least since there cannot be spaces at domains). And as I mentioned, case 14 also goes against the rules for valid e-mail addresses by having a real number as a domain.

goc3 on 28 Sep 2020

Cases 4 and 14 now have a correct_answer of false, per the explanation by Rafael S.T. Vieira.

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Problem 44231. Is it a mail?

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Problem 44231. Is it a mail?

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