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. </w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>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.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:hyperlink w:docLocation=\"https://stackoverflow.com/questions/2049502/what-characters-are-allowed-in-an-email-address\"><w:r><w:t>Reference</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: 20.4333px; 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: 400; text-decoration: rgb(0, 0, 0); white-space: normal; "><div style="block-size: 165px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 82.5px; transform-origin: 407px 82.5px; vertical-align: baseline; "><div style="block-size: 84px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 42px; text-align: left; transform-origin: 384px 42px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 361.5px 8px; transform-origin: 361.5px 8px; unicode-bidi: normal; "><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. </span></span></div><div style="block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 383.5px 8px; transform-origin: 383.5px 8px; unicode-bidi: normal; "><span style="">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.</span></span></div><div style="block-size: 21px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 10.5px; text-align: left; transform-origin: 384px 10.5px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><a target='_blank' href = "https://stackoverflow.com/questions/2049502/what-characters-are-allowed-in-an-email-address"><span style=""><span style="">Reference</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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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.

Christian Schröder on 4 Mar 2023

You should really add some unusual email addresses like "@"@example.com or "\""@example.com or root@[127.0.0.1] to the test suite!

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Problem 44231. Is it a mail?

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Problem 44231. Is it a mail?

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